Stephanie and the LazyTown children decide to repay Sportacus for all of his heroics by giving him a day off - with Stephanie taking over as hero. Robbie Rotten decides to take advantage, and builds a nasty dog which runs amok in the town.
| Actor | Role |
|---|---|
 Magnús SchevingSportacus | Sportacus |
 Julianna Rose MaurielloStephanie | Stephanie |
 Stefán Karl StefánssonRobbie Rotten | Robbie Rotten |
| GGuðmundur Þór KárasonZiggy (puppeteer) | Ziggy (puppeteer) |
| JJodi EichelbergerStingy (puppeteer) | Stingy (puppeteer) |
| SSarah BurgessTrixie (puppeteer) | Trixie (puppeteer) |
| JJulie WestwoodPixel (puppeteer) | Pixel (puppeteer) |
| JJulie WestwoodBessie (puppeteer) | Bessie (puppeteer) |
| DDavid Matthew FeldmanMayor Meanswell (puppeteer) | Mayor Meanswell (puppeteer) |
| KKobie PowellPixel (voice) | Pixel (voice) |