The Doctor and Mel go for a holiday trip to Shangri-La aboard a Nostalgia Tours bus, only to get dragged into the battle against genocide of their fellow passenger Delta, a Chimeron Queen fleeing from the Bannermen who wish to make her species extinct.
| Actor | Role |
|---|---|
 Sylvester McCoyThe Doctor | The Doctor |
 Bonnie LangfordMel Bush | Mel Bush |
 Don HendersonGavrok | Gavrok |
 Belinda MayneDelta | Delta |
 Stubby KayeWeismuller | Weismuller |
 Morgan DeareHawk | Hawk |
 Ken DoddTollmaster | Tollmaster |
 Richard DaviesBurton | Burton |
 David KinderBilly | Billy |
 Sara GriffithsRay | Ray |
| JJohnny DennisMurray | Murray |
| BBrian HibbardKeillor | Keillor |
| TTim ScottChima | Chima |
| AAnita GrahamBollitt | Bollitt |
| LLeslie MeadowsAdlon | Adlon |
| RRobin AsplandThe Lorells member | The Lorells member |
 Keff McCullochThe Lorells member | The Lorells member |
| JJustin MyersThe Lorells member | The Lorells member |
| RRalph SalminsThe Lorells member | The Lorells member |
| TTracey WilsonVocalist | Vocalist |
| JJodie Brooke WilsonVocalist | Vocalist |
 Hugh LloydGoronwy | Goronwy |
| MMartyn GeraintVinny | Vinny |
| CClive CondonCallon | Callon |
| RRichard MitchleyArex | Arex |
| JJessica McGoughYoung Chimeron | Young Chimeron |
| AAmy OsbornYoung Chimeron | Young Chimeron |
| LLaura CollinsChimeron Princess | Chimeron Princess |
| CCarley JosephChimeron Princess | Chimeron Princess |