A mad scientist ignores each of his creations when he shifts his attention to the next monster. His first creation, Stitch Head, searching for purpose, takes it upon himself to look after all the other monsters.
| Actor | Role |
|---|---|
 Asa ButterfieldStitch Head (voice) | Stitch Head (voice) |
 Joel FryCreature (voice) | Creature (voice) |
 Alison SteadmanNan (voice) | Nan (voice) |
 Rob BrydonProfessor (voice) | Professor (voice) |
| SSeth UsdenovFulbert Freakfinder (voice) | Fulbert Freakfinder (voice) |
 Fern BradyMadame Miranda (voice) | Madame Miranda (voice) |
 Tia BannonArabella (voice) | Arabella (voice) |
 Jamali MaddixTaj/Tej (voice) | Taj/Tej (voice) |
 Paul TylakOwggagoffakkookkk (voice) | Owggagoffakkookkk (voice) |
| RRuth GibsonOld Lady (voice) | Old Lady (voice) |
 Rasmus HardikerGeoff (voice) | Geoff (voice) |
 Ryan SampsonDoctor Dislocation (voice) | Doctor Dislocation (voice) |
 Steve HudsonWoodlouse (voice) | Woodlouse (voice) |
| GGemma SaundersPigbutt (voice) | Pigbutt (voice) |
| SSway Clarke IITiny Monster (voice) | Tiny Monster (voice) |