 Japanese title card · “I Can Do It for Your Sake” | |
| Series | Sonic X (ソニックX), TMS Entertainment |
| Season | Season 3 (2005–2006) |
| Episode | Season 3, episode 25 · no. 77 of 78 |
| English title | “A Fearless Friend” (4Kids) |
| Japanese title | 君のためにできること (Kimi no Tame ni Dekiru Koto, “I Can Do It for Your Sake”) |
| Japan | Not shown on Japanese TV until 29 April 2020 (Kids Station) |
| First aired (US) | 29 April 2006 · 4Kids TV (Fox) |
| Directed by | Mitsutaka Noshitani |
| Written by | Kiyoko Yoshimura |
| Storyboard | Masanori Mizuhara |
| Previous episode | The Light in the Darkness (S03E24) |
| Next episode | So Long Sonic (S03E26) |
Final battle, part 3Cosmo’s sacrifice
A Fearless Friend is episode 25 of Season 3 of Sonic X and the 77th of the anime’s 78 episodes. In Japan it is called “I Can Do It for Your Sake” (君のためにできること). It premiered in English: 4Kids aired it on 4Kids TV (Fox) on 29 April 2006, after a French TV debut on 17 April 2005, while Japanese TV only showed it on 29 April 2020. It was directed by Mitsutaka Noshitani and written by Kiyoko Yoshimura.
Synopsis
The Final Mova finishes turning into a giant seed and shrugs off all that Sonic and Shadow can throw at it. Its waves start draining animals and robots across the galaxy while plants run wild. Eggman thinks the drained Chaos Emeralds, gathered up by the Chaotix, could be recharged, and Cosmo – of the same race as the Metarex, and unharmed by the waves – sets off to carry them.
Dark Oak’s vines catch her and the gems fall into space, where the Planet Eggs inside the seed react to them, stopping the waves and recharging the Emeralds. Setting their differences aside, Sonic and Shadow become Super Sonic and Super Shadow and rip the seed apart – but Dark Oak survives, crushing its core into a blast that could destroy the universe.
In Cosmo’s mind, her mother Earthia tells her that saving the galaxy is her destiny. Cosmo transforms, roots herself on the core as a tree to hold Dark Oak still, and asks Tails to fire the Sonic Driver with both super hedgehogs inside. After agonising, Tails says goodbye and presses the button.
Key Moments
- Super Sonic and Super Shadow unite.
- Cosmo roots herself on the Final Mova.
- Tails fires the Sonic Driver.
Trivia
- Kiyoko Yoshimura wrote the final three episodes.
- On home video: the So Long, Sonic DVD set (2007); and Discotek’s Sonic X Collection 2 (2016) and complete-series Blu-rays.
Watch the Episode
The full 4Kids English episode, uploaded by TMS Entertainment’s official “Anime! on TMS” YouTube channel (checked 6 November 2026).
Part of our Sonic X Season 3 guide. See the Sonic X series page for the cast, theme songs and home video.
Sources: titles, credits and air dates from Wikipedia’s list of Sonic X episodes and Sonic Wiki Zone, cross-checked with each other and with Luke’s original Sonic Scene episode table; synopsis written for Sonic Scene from the episode, Wikipedia’s summary and Sonic Wiki Zone’s plot notes; title card and screenshots via Sonic Wiki Zone, copied to our media library.