![]() | |
| Series | Sonic Boom (TV series, 2014–2017) |
| Season | Season 1, episode 45 (S01E45) |
| Episode no. | 45 of 104 |
| US premiere | 26 September 2015 · Cartoon Network |
| France | 31 August 2015 · Robot contre robot |
| Written by | Story by Romain van Liemt; teleplay by Benoit Grenier |
| Storyboard | Jean-Charles Andre |
| Directed by | Natalys Raut-Sieuzac |
| US viewers | 0.87 million (Nielsen, premiere) |
| Previous | It Wasn’t Me, It Was the One-Armed Hedgehog (S01E44) |
| Next | No Robots Allowed (S01E46) |
Robot Battle Royale is episode 45 of Season 1 of Sonic Boom, the CGI comedy series made by OuiDo! Productions with Sega of America. It premiered in the United States on 26 September 2015 on Cartoon Network.
Synopsis

Knuckles has a new calling. He scratches his back with Tails’ latest gadget, Sonic jokes that he has invented something, and the echidna takes it to heart. Armed with a flyer for a no-holds-barred robot fighting tournament and a few playground taunts, he bullies Tails into a head-to-head contest of inventors.
Knuckles’ entry, the Vacuu-Fan 2000, is knocked out in the first round, as everyone expected. Tails’ Hypnobot, built to take control of other machines, makes the final, where it meets a scaled-down robot belonging to Eggman, who has cheated his way to the top: his company built the box that was supposed to keep everyone’s override codes safe. Victory in hand, he heads for Tails’ workshop to hypnotise everything in it.
The one machine he can’t hijack is Knuckles’ useless fan, which has no brain to control, so Tails rides inside it right up to Hypnobot and flips the controls back. The doctor’s army ends up dancing, and he slinks off in disgrace. Knuckles retires from inventing while he is ahead, and Sonic declares the Eggman problem solved, moments before a rival contestant’s robot dog kicks Hypnobot into orbit.

Trivia
- Hypnobot, the robot Tails builds here, comes back to cause trouble in Season 2’s “Robots from the Sky”.
- On DVD: Universal’s UK volume No Robots Allowed (10 Oct 2016); in the US, NCircle’s Season One, Volume Two (2020) and The Complete Season 1 (2021).
- French title: Robot contre robot. The episode aired in France on 31 August 2015, before its US premiere.
- About 0.87 million US viewers watched the premiere broadcast (Nielsen figures as listed by Wikipedia).
Watch the Episode
This episode does not have an official full upload on YouTube at the time of writing. Season 1 is on DVD from NCircle in the US (The Complete Season 1, 2021) and Universal in the UK (2016), and has been available on services including Hulu, Netflix and Tubi; see the series page for details.
Part of our Sonic Boom Season 1 guide. See the series page for the cast, the redesigns, the games and the comics.
Sources: air dates, writers and storyboard artists from Luke’s original Sonic Scene episode list, cross-checked with Wikipedia, Sonic Retro (Wayback copy) and Sonic Wiki Zone; synopsis written for Sonic Scene from the episode summaries on those sites; title card and screenshots via Sonic Wiki Zone, copied to our media library.

