 Japanese title card · “Raiding Egg Fort the Flying Fortress!” | |
| Series | Sonic X (ソニックX), TMS Entertainment |
| Season | Season 1 (2003–2004) |
| Episode | Season 1, episode 15 · no. 15 of 78 |
| English title | “Skirmish in the Sky” (4Kids) |
| Japanese title | 移動要塞エッグフォート襲来！ (Idōyōsai Eggu Fōto Shūrai!, “Raiding Egg Fort the Flying Fortress!”) |
| First aired (Japan) | 13 July 2003 · TV Tokyo |
| First aired (US) | 13 December 2003 · Fox Box (Fox) |
| Directed by | Toshikiyo Ishikawa |
| Written by | Kiyoko Yoshimura |
| Storyboard | Toshihiko Masuda |
| Previous episode | That’s What Friends Are For (S01E14) |
| Next episode | Depths of Danger (S01E16) |
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Skirmish in the Sky is episode 15 of Season 1 of Sonic X and the 15th of the anime’s 78 episodes. In Japan it is called “Raiding Egg Fort the Flying Fortress!” (移動要塞エッグフォート襲来！). It premiered on TV Tokyo on 13 July 2003, and the 4Kids English version followed on Fox Box (Fox) on 13 December 2003. It was directed by Toshikiyo Ishikawa and written by Kiyoko Yoshimura.
Synopsis
Chris gives Sonic a mobile phone, but Sonic tosses it to Amy and runs off – he would rather not be on call. Now that the public knows them, the others head into Station Square with Chris and Ella for a shopping trip, only to find that heroes can’t try on clothes or eat a snack without a crowd staring.
At the ruins of Eggman’s base, the rubble heaves and the Egg Fort, a flying battleship, rises out of the ground. Eggman turns its guns on the city, and while his E-43 Falcons and other robots keep Sonic busy, Chris’ group is cut off in the streets.
They fight their way out with unexpected help from Mr. Stewart and Sam Speed, and Mr. Tanaka turns up in a futuristic truck carrying the X-Tornado. Sonic lures the Egg Fort away from the city and out over the ocean, then uses two Rings at once to slice straight through it. The fortress sinks, but nobody believes Eggman is finished.
Key Moments
- The Egg Fort, Eggman’s flying fortress, makes its debut.
- Chris gives Sonic a mobile phone.
- Mr. Stewart, Sam Speed and Mr. Tanaka help Chris’ group.
Trivia
- Translations of the Japanese title vary: our 2017 table gave “Raiding Egg Fort the Flying Fortress!”, while Wikipedia now prefers “Attack of the Mobile Fortress, Egg Fort!”.
- On home video: Japanese DVD/VHS volume 4 (Victor Entertainment, 22 October 2003); 4Kids/FUNimation volume 4, Beating Eggman (7 December 2004); the Chaos Emerald Chaos DVD set (2008); and Discotek’s Sonic X Collection 1 (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 1 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.