When they were young, the brothers Mutta and Hibito promised each other they would become astronauts. Now, in 2025, Hibito has followed his dream to become the first Japanese on the moon, but Mutta has just been fired from his job. His brother reminds him of their childhood promise, and Mutta decides once again to aim for space.
You can now watch Space Brothers online on the following streaming providers in the United States.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | Little Brother Hibito and Big Brother Mutta | 2012-04-01 | 25 min |
| Season 1 | Episode 2 | My Shining Star | 2012-04-08 | 25 min |
| Season 1 | Episode 3 | The Man with the Advantage and the Running Female Doctor | 2012-04-15 | 25 min |
| Season 1 | Episode 4 | Next to Hibito | 2012-04-22 | 25 min |
| Season 1 | Episode 5 | Days of Missing | 2012-04-29 | 25 min |
| Season 1 | Episode 6 | Et Cetera in My Head | 2012-05-06 | 25 min |
| Season 1 | Episode 7 | Dear Hibito | 2012-05-13 | 25 min |
| Season 1 | Episode 8 | Smoky Heaven | 2012-05-20 | 25 min |
| Season 1 | Episode 9 | Individual Resolve | 2012-05-27 | 25 min |
| Season 1 | Episode 10 | Running Bus | 2012-06-03 | 25 min |
| Season 1 | Episode 11 | Trapped Rivals | 2012-06-10 | 25 min |
| Season 1 | Episode 12 | My Name is Itou Serika | 2012-06-17 | 25 min |
| Season 1 | Episode 13 | 3-D Ant | 2012-06-24 | 25 min |
| Season 1 | Episode 14 | Broken Glasses and the Sole of the Foot | 2012-07-01 | 25 min |
| Season 1 | Episode 15 | Let's Talk About Space | 2012-07-08 | 25 min |
| Season 1 | Episode 16 | Alarm, But No Clock | 2012-07-15 | 25 min |
| Season 1 | Episode 17 | The Culprit is in the Room | 2012-07-22 | 25 min |
| Season 1 | Episode 18 | Ka-pe! Kenji! | 2012-07-29 | 25 min |
| Season 1 | Episode 19 | The Day Before Goodbye | 2012-08-05 | 25 min |
| Season 1 | Episode 20 | The Worst Possible Punishment | 2012-08-12 | 25 min |
| Season 1 | Episode 21 | A Long-Awaited Glimpse of the Sky | 2012-08-19 | 25 min |
| Season 1 | Episode 22 | Working on the Dream | 2012-09-02 | 25 min |
| Season 1 | Episode 23 | Father, Son, and Mutta Claus | 2012-09-09 | 25 min |
| Season 1 | Episode 24 | The Worst Possible Interviewer | 2012-09-16 | 25 min |
| Season 1 | Episode 25 | Sonic Little Brother Training Big Brother | 2012-09-23 | 25 min |
| Season 1 | Episode 26 | Painful Interview | 2012-09-30 | 25 min |
| Season 1 | Episode 27 | One Question | 2012-10-07 | 25 min |
| Season 1 | Episode 28 | Miracle of Doha | 2012-10-14 | 25 min |
| Season 1 | Episode 29 | Night Before Launch | 2012-10-21 | 25 min |
| Season 1 | Episode 30 | Dog, Old Man, and Alexander | 2012-10-28 | 25 min |
| Season 1 | Episode 31 | Rocket Road | 2012-11-04 | 25 min |
| Season 1 | Episode 32 | A Private Place | 2012-11-11 | 25 min |
| Season 1 | Episode 33 | Moon Rabbit | 2012-11-18 | 25 min |
| Season 1 | Episode 34 | Pug and Hug on a Moonlit Night | 2012-11-25 | 25 min |
| Season 1 | Episode 35 | From the Little Corner of a Big Facility | 2012-12-02 | 25 min |
| Season 1 | Episode 36 | Dancing Astronaut | 2012-12-09 | 25 min |
| Season 1 | Episode 37 | Two Men in the Park | 2012-12-16 | 25 min |
| Season 1 | Episode 38 | Eleventh E-mail | 2012-12-23 | 25 min |
| Season 1 | Episode 39 | Lunar Illusions | 2013-01-06 | 25 min |
| Season 1 | Episode 40 | Heaven and Hell | 2013-01-13 | 25 min |
| Season 1 | Episode 41 | Eighty Minutes to Live | 2013-01-20 | 25 min |
| Season 1 | Episode 42 | Hibito's Choice | 2013-01-27 | 25 min |
| Season 1 | Episode 43 | Brian | 2013-02-03 | 25 min |
| Season 1 | Episode 44 | Three Astronauts | 2013-02-10 | 25 min |
| Season 1 | Episode 45 | Five Blue Rangers | 2013-02-17 | 25 min |
| Season 1 | Episode 46 | Number One Restless Guy | 2013-02-24 | 25 min |
| Season 1 | Episode 47 | The First Promise | 2013-03-03 | 25 min |
| Season 1 | Episode 48 | Always Have a Pedometer in Your Heart | 2013-03-10 | 25 min |
| Season 1 | Episode 49 | Nitta the Leader | 2013-03-17 | 25 min |
| Season 1 | Episode 50 | Nitta and Mutta | 2013-03-24 | 25 min |
| Season 1 | Episode 51 | Living Stone | 2013-03-31 | 25 min |
| Season 2 | Episode 1 | A Big Brother is Always... | 2013-04-06 | 25 min |
| Season 2 | Episode 2 | Stand on the Moon Together Alive | 2013-04-13 | 25 min |
| Season 2 | Episode 3 | Do I Have Good Luck? | 2013-04-20 | 25 min |
| Season 2 | Episode 4 | Distant Goal | 2013-04-27 | 25 min |
| Season 2 | Episode 5 | A Promise Over a Drink | 2013-05-04 | 25 min |
| Season 2 | Episode 6 | An Engineer's Switch | 2013-05-11 | 25 min |
| Season 2 | Episode 7 | Earnest Failure | 2013-05-18 | 25 min |
| Season 2 | Episode 8 | Promise Sign | 2013-05-25 | 25 min |
| Season 2 | Episode 9 | Sea Diver and Space Diver | 2013-06-01 | 25 min |
| Season 2 | Episode 10 | Those Who Wait for Hibito | 2013-06-08 | 25 min |
| Season 2 | Episode 11 | Those Who Dream Far | 2013-06-15 | 25 min |
| Season 2 | Episode 12 | Young Excitement | 2013-06-22 | 25 min |
| Season 2 | Episode 13 | Piece of Cake | 2013-06-29 | 25 min |
| Season 2 | Episode 14 | Wheelchair Pilot | 2013-07-13 | 25 min |
| Season 2 | Episode 15 | Two Notebooks | 2013-07-20 | 25 min |
| Season 2 | Episode 16 | Deneil-ized! | 2013-07-27 | 25 min |
| Season 2 | Episode 17 | Two Keyboards | 2013-08-03 | 25 min |
| Season 2 | Episode 18 | Next to Hibito | 2013-08-10 | 25 min |
| Season 2 | Episode 19 | Determination to Give Up | 2013-08-17 | 25 min |
| Season 2 | Episode 20 | Rehearsal | 2013-08-31 | 25 min |
| Season 2 | Episode 21 | Hibito's Disorder | 2013-09-07 | 25 min |
| Season 2 | Episode 22 | A Road on the Roadless Moon | 2013-09-14 | 25 min |
| Season 2 | Episode 23 | Magic Trick | 2013-09-21 | 25 min |
| Season 2 | Episode 24 | My Hands | 2013-09-28 | 25 min |
| Season 2 | Episode 25 | Olga | 2013-10-05 | 25 min |
| Season 2 | Episode 26 | An Astronaut's Daughter | 2013-10-12 | 25 min |
| Season 2 | Episode 27 | Out of Time | 2013-10-19 | 25 min |
| Season 2 | Episode 28 | Olga, Hibito and Gagarin | 2013-10-26 | 25 min |
| Season 2 | Episode 29 | Secret | 2013-11-02 | 25 min |
| Season 2 | Episode 30 | Worst Enemy | 2013-11-09 | 25 min |
| Season 2 | Episode 31 | Space Family | 2013-11-16 | 25 min |
| Season 2 | Episode 32 | Kenji and I | 2013-11-23 | 25 min |
| Season 2 | Episode 33 | Supandaman | 2013-11-30 | 25 min |
| Season 2 | Episode 34 | On the Moon's Surface | 2013-12-07 | 25 min |
| Season 2 | Episode 35 | For Tomorrow | 2013-12-14 | 25 min |
| Season 2 | Episode 36 | To the Place Where I Belong | 2013-12-21 | 25 min |
| Season 2 | Episode 37 | Pretty Dog | 2014-01-04 | 25 min |
| Season 2 | Episode 38 | Last Words | 2014-01-11 | 25 min |
| Season 2 | Episode 39 | A Small Note and a Big Lucky Charm | 2014-01-18 | 25 min |
| Season 2 | Episode 40 | How to Help Hibito | 2014-01-25 | 25 min |
| Season 2 | Episode 41 | Lonely People | 2014-02-01 | 25 min |
| Season 2 | Episode 42 | In the Corner of My Heart | 2014-02-08 | 25 min |
| Season 2 | Episode 43 | Exciting Teamwork | 2014-02-15 | 25 min |
| Season 2 | Episode 44 | Our History | 2014-02-22 | 25 min |
| Season 2 | Episode 45 | Astronaut and Father | 2014-03-01 | 25 min |
| Season 2 | Episode 46 | Won't Go Away | 2014-03-08 | 25 min |
| Season 2 | Episode 47 | The Ultimate Astronaut | 2014-03-15 | 25 min |
| Season 2 | Episode 48 | People Change, Promises Don't | 2014-03-22 | 25 min |
| Sound | Katsuyoshi Kobayashi | Sound Director |
| Visual Effects | Koji Yabuno | Character Designer |
| Directing | Ayumu Watanabe | Series Director |
| Sound | Toshiya Wada | Sound Effects |
| Sound | Toshiyuki Watanabe | Original Music Composer |
| Camera | Masaharu Okazaki | Director of Photography |
