Watch "Space Brothers" on Netflix USA

When brothers Mutta and Hibito were kids, they vowed to become astronauts. While Hibito joins NASA, Mutta's path in life leaves him down on his luck.

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After passing screening for the Japan Aerospace Exploration Agency exam, Mutta debates taking it until he hears words of advice from an old friend.

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While Mutta continues on his road into JAXA, the pressure mounts as he faces his most trying test yet: the grueling medical and physical evaluation.

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Mutta is subjected to an in-depth final interview and steels himself to face the panel. But despite his resolve, the last question has him reeling.

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After touching down in Houston, home to NASA's center for human spaceflight. Mutta is chased down by an excited dog that belongs to a familiar face.

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Mutta visits NASA's Lyndon B. Johnson Space Center. While its sheer scale blows him away, it isn't the only thing that exceeds his expectations.

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After Mutta's past puts his future at JAXA in jeopardy, he distracts himself with news media. Hibito notices that something is on his brother's mind.

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After stopping a robbery at a diner, Mutta is celebrated in both the U.S. and Japan. However, the truth of what actually happened is far less heroic.

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As Mutta returns to Japan, he can't get his brother's will off his mind. Later, he meets with his friend Kenji and they discuss their futures.

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Despite having reservations at first, Mutta heads to JAXA for his third exam. But, this time, passing will require more than just brains and brawn.

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Arriving at the test facility, Mutta and his fellow examinees are shown a video to test their resolve before they can learn the content of the exam.

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After being split into teams, Mutta and the others tackle the first assignment in their exam. Later, everyone gets to learn more about each other.

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The examinees are tasked with winning over a journalist critical of space travel. Mutta recalls the words of JAXA astronaut Soichi Noguchi.

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Five days into life in lockdown, Fukuda, the oldest of the examinees, has his glasses broken. But he refuses to let such a small thing hold him back.

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Team B begins to turn on one another as they search for the source of a mysterious alarm. Meanwhile, Team A wakes up to find evidence of sabotage.

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As tensions rise in Team A over their broken clock, Mutta is sure of the culprit. The offender's motive, however, remains a mystery.

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Team A investigates an obnoxious alarm. Remembering something he heard at NASA, Mutta turns his suspicion away from his team members.

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Though Team A has overcome four problems, Mutta realizes that it is now his turn to create a nuisance. Meanwhile, Kenji faces a tough choice.

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With only two days of lockdown left, Kenji brings Team B closer together, while Mutta tells Team A that he has good news and bad news.

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On the final day of lockdown, Both Team A and Team B are given two hours to decide the two members they believe should become JAXA astronauts.

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Mutta and the others are finally released from lockdown. Only a few move on to the next stage, but it's not the end of the road for those not chosen.

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The Team A members gather for drinks to celebrate the two winning candidates. Later, Mutta learns that one remaining examinee will be sent to Houston.

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Mutta's parents celebrate his opportunity to keep following his dreams. But the celebrations don't last long as Mutta is soon forced to find a job.

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Mutta eases into his new life with his brother. While Hibito begins learning to drive moon buggies, Mutta takes the wheel on a ride of his own.

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Hibito recalls meeting his idol Azuma, the austere veteran astronaut. Knowing that Azuma will conduct the final interview, Mutta asks for advice.

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Mutta faces his final interview. However, thanks to an intense leg workout the day before, the intimating interviewers are the least of his problems.

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At a special function, Azuma asks new recruit Mutta the same question he himself was asked during his rookie days: “Are you prepared to die?”

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Just days away from flying to the moon, Hibito reminisces about his childhood with Mutta and the UFO that sparked their dreams of being astronauts.

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Ahead of Hibito's trip to the moon, NASA launches a rocket with supplies for the moonbase. Mutta's mother expresses concerns about her son's trip.

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On the day of Hibito's fateful launch, his dog Apo goes missing. As Mutta heads out in search of the pug, he meets a mysterious old man driving a van.

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After Mutta watches Hibito's shuttle launch into space, he thinks back on the first time he and his brother got the chance to speak to an astronaut.

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Mutta stays behind in Houston while his fellow candidates fly back to Japan, allowing him the chance to see another side of senior astronaut Azuma.

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All of Japan watches with bated breath as Hibito and his crew descend to the moon's surface and Hibito becomes the first Japanese person on the moon.

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Hibito and his crew take the crucial first step in their moonbase construction project: boarding their mobile vehicle and taking off their helmets.

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Kenji receives a highly anticipated phone call from JAXA and thinks back on everything that led up to him choosing to become an astronaut.

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Upon receiving a phone call from JAXA, Serika visits her father's grave and reminisces about her childhood and what made her aim for the stars.

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Mutta worries that he's run out of luck as he awaits a phone call from JAXA. Meanwhile, Mizoguchi gets his results and thinks back on his efforts.

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Mutta is taken to a press conference where he reunites with his fellow examinees and prays that he won't mess up and say something foolish.

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Before training begins, Mutta and the four other new JAXA recruits receive some words of wisdom. Hibito and Damien take a moon buggy on a mission.

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Down in the crater with no light and no way to communicate with mission control or his crew, Hibito begins his search for his crewmate.

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Hibito suffers a fall that leaves a puncture in his oxygen tank. With the clock ticking, the crew down in Houston begin to devise a rescue plan.

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Hibito runs dangerously low on oxygen. With only one flare left, he must choose between signaling for help and saving the life of his crewmate.

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As Hibito awaits his rescue, he finds an item that reminds him of his mentor. But with his oxygen nearly at zero, he has little time left.

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Hibito's situation takes a surprising turn. Azuma's quick thinking is praised by the flight controller, but he isn't willing to accept all the credit.

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Mutta visits Sharon and learns that her astronomy team has received funding to build a lunar telescope on the moon, an idea inspired by her husband.

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Mutta draws stares after changing into his flight suit at the airport. Meanwhile, Serika and Ena discuss their last meals before leaving for the U.S.

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Having arrived in Houston, the JAXA candidates begin looking for places to live. Mutta heads to NASA to ask Murasaki what he said to Kenji.

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Serika, Mutta and the other rookie astronauts take a long bus ride to the starting location of their survival training — a barren desert.

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Mutta's team finds a spot to set up camp for the night. However, they learn that they aren't performing as well as expected and must face a penalty.

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On day five of survival training, Nitta tells the team he will go back alone to find his lost phone. But as team leader, Mutta insists on helping him.

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Having found the lost phone, Nitta and Mutta head back to camp. On the way, Nitta opens up about his relationship with his younger brother.

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Under a starry night sky in the desert, Mutta and his team find a frog, prompting Mutta to recall the fateful night he decided to become an astronaut.

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Two months after arriving on the moon, Hibito is kept cooped up inside the base. Staring into space, he recalls the accident that nearly killed him.

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Huddled around a campfire in the desert, Mutta sees a cactus that reminds him of a rocket and the events of the day his brother set off to the moon.

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Mutta comes down with a fever. With the entire team's future as astronauts on the line, their leader must decide whether to retire or push on.

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In their next training exercise, Mutta's group is teamed with Pico, a disheveled engineer whose lack of motivation fails to inspire confidence.

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Receiving little help from Pico, Mutta and his team continue to run into issues with their parachute, leaving them to find the solution on their own.

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On their drive, Vince tells Mutta about whom he considers his worst enemy. Later over drinks, Pico and Vince reminisce about their childhood friend.

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Vince and Pico continue to reflect on their old friend Rick and the tragic event that led them to defy their parents' wishes and become astronauts.

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With little time left before the competition, Mutta and his team frantically work to devise a way of keeping the sponge tires on their rover dry.

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The day of Hibito's return finally arrives. People around the globe watch anxiously in hopes that Pico's parachute system will succeed.

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Hibito and his crew begin their long road to rehabilitation. Meanwhile, Sharon visits the U.S. to propose the construction of a lunar telescope.

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In order to receive their pilot's licenses, Mutta and the other candidates are given the task of learning three weeks of material in just three days.

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Mutta, Hibito and Serika accompany Sharon to the hospital, where Serika expresses her fears that Sharon might be in the early stages of ALS.

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While the other candidates are paired with senior pilots to begin flight training, Mutta must take a make-up test after scoring low on his first one.

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Paired with veteran pilot Deniel Young, Mutta puts on a special flight suit designed to withstand heavy g-force and takes off on his first flight.

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Mutta puts his heart into his pilot training, but he struggles to concentrate on multitasking when Deniel incessantly interferes with his flying.

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Hibito returns to Japan to much fanfare. Later, he takes a break from his busy schedule of public appearances to visit Sharon and give her a gift.

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Mutta undergoes astronaut training, including using a pool to simulate a spacewalk. Later, Mutta joins Deniel for the old man's final flight.

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Now a full-fledged astronaut, Mutta receives the offer of a lifetime. But with his sights set on going to the moon, he considers turning it down.

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Mutta and Hibito head to a photo shoot for a magazine cover. On the way, Mutta picks Hibito's brain about what it's like driving a lunar rover.

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After suffering a panic attack during zero-gravity training, Hibito is denied a spot on another mission to space. He later turns to Sharon for advice.

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With the help of his old employer and the OK from JAXA, Mutta presents to NASA officials a plan for a new lunar rover that won't fall into craters.

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Chief Butler of the Astronaut Corps works to decide the next lunar mission crew. In order to impress him, Mutta practices a difficult flight maneuver.

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After Mutta pulls off the flight maneuver, Chief Butler drops by the airfield to see him, only to catch sight of a trick meant for someone else.

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Hibito begins his new life and rehabilitation regimen in Russia. There, he is invited to have dinner at the house of legendary astronaut Ivan Tolstoy.

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Ivan gives Hibito a DVD of Olga's childhood ballet lessons and tells him to watch it. Hibito later goes to see her performance and has a realization.

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Motivated by Olga's performance, Hibito restarts his rehabilitation. Ivan proposes a unique way of getting Hibito used to wearing a space suit again.

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Just as Hibito begins to see results from his rehabilitation, he is ordered to return to Houston. Angered by the news, Ivan confronts his colleague.

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Mutta learns that he will undergo training for lunar missions. Bidding farewell to the rover team, he joins a new group of 12 other astronauts.

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Joined by a familiar face, Mutta begins his two-week lunar training stint under the sea with a group of senior astronauts dubbed the "Monsters."

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Ena receives an exciting new assignment. Meanwhile, Mutta and Kenji are tasked with designing a model of the moon base with improvements.

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Mutta and Kenji's new rivalry causes a rift between the two friends. When Kenji suggests changes to their design, Mutta hesitates to give his opinion.

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Mutta is warned that his plans will leave him with no time to actually build his model. But Mutta has an idea to help speed things up.

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Though only one of them will be chosen for the mission, Kenji and Mutta start to work well together again. Later, Mutta receives a discouraging email.

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Mutta's idea to funnel natural light into the moon base is met with great praise. Meanwhile, Hibito grows bored with his dull new job.

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Hibito watches the second part of Olga's ballet lesson videos, learning how she was inspired to dance again after recovering from her injury.

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Hibito experiences a sudden panic attack brought on by a nightmare. Looking to confide in his older brother, he invites Mutta out for a drink.

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After staying up all night researching Hibito's disorder, a sleep-deprived Mutta begins training as Vince's backup on the next lunar mission.

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Just before Hibito begins his test to be restored to active duty, he receives an encouraging gift from Mutta that reminds him of a childhood game.

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An alarm during Hibito's underwater test threatens to send him into another panic attack. But some old friends arrive poolside to offer support.

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Mutta begins his training as a member of the lunar mission backup crew and acquaints himself with the other eccentric members of the group.

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Sharon visits Houston to present her revised plans for the lunar telescope. Meanwhile, Chief Butler approaches a veteran astronaut with a proposal.

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Mutta continues his desert training with the rest of the backup crew members. But with everyone going at their own pace, the team lacks cohesion.

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Mutta and his training buddies watch as the International Space Station passes overhead, which prompts Betty to think back on memories of her husband.

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As Kenji awaits the birth of his second child, he worries that his training has no clear goal. At the holiday party, Butler takes him and Nitta aside.

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Mutta and Hibito's parents visit Houston for New Year. Hibito confesses to his brother that he is unsure if he will ever travel to the moon again.

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Mutta struggles to concentrate on his training after his brother disappears and won't answer messages. Later, Butler reveals to Mutta why Hibito left.

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Pico steps in when things get heated between Vince and Mutta. Hibito finally contacts Mutta and tells him what he plans to do going forward.

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