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| Series | Sonic Boom (TV series, 2014–2017) |
| Season | Season 1, episode 20 (S01E20) |
| Episode no. | 20 of 104 |
| US premiere | 4 April 2015 · Cartoon Network |
| France | 18 February 2015 · Un jour sans fin |
| Written by | Joelle Sellner |
| Storyboard | Jordi Valbuena |
| Directed by | Natalys Raut-Sieuzac |
| US viewers | 0.86 million (Nielsen, premiere) |
| Previous | Sole Power (S01E19) |
| Next | Sleeping Giant (S01E21) |
Hedgehog Day is episode 20 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 4 April 2015 on Cartoon Network.
Synopsis

Eggman finally beats Sonic, and it doesn’t count. A lightning bolt striking between his plasma ball and his laser in mid-battle has trapped him in a time loop, and every morning Orbot serves the same breakfast. Using his foreknowledge he perfects the attack, down to making sure Team Sonic rent a silent film so Tails’ projector can’t be turned into a weapon, and wins. Then the day resets.
So he does what anyone would do with no consequences: junk food, a trimmed moustache, then the unthinkable. He asks Sonic and Tails for help, winning them over by predicting the future and spoiling the end of their film. Tails’ solution, trapping the reaction in a super-dense container, takes two more loops just to hear in full, a day to build and several more loops because Knuckles, the one strong enough to carry it, keeps stalling.
The reason is a dentist’s appointment he is dreading, and Sticks solves that by pulling the tooth herself. When Eggman next wakes up, Orbot is serving sausages instead of bacon, and the overjoyed doctor hugs him, just as a flash goes off. It is only Cubot, taking a photo.

Trivia
- A time-loop story named after the 1993 film Groundhog Day.
- On DVD: Universal’s UK volume Hedgehog Day (30 May 2016); in the US, NCircle’s Season One, Volume One (2019) and The Complete Season 1 (2021).
- French title: Un jour sans fin. The episode aired in France on 18 February 2015, before its US premiere.
- About 0.86 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.

