When Evil Calls centers around the mysterious appearance of a text message that grants the students of Wilburn High School their wildest desires.
| Actor | Role |
|---|---|
 Sean PertweeThe Janitor | The Janitor |
 Dominique PinonDetective Ringwald | Detective Ringwald |
 Lois WinstoneKirsty | Kirsty |
 Jennifer LimSamantha | Samantha |
 Chris BarrieHeadmaster / Samantha’s Father | Headmaster / Samantha’s Father |
 Rick WardenMr. Dale | Mr. Dale |
 Sean BrosnanNelson | Nelson |
 Oscar PearceThe Clown | The Clown |
| LLucy BarkerMiss Nibb | Miss Nibb |
| SShaun HutsonDaniel's Stepdad | Daniel's Stepdad |
| VVictoria AitkenJane | Jane |
 Gemma ChanMolly Nelson | Molly Nelson |
 Marysia KayAlice | Alice |
 Rebecca SummersLaura | Laura |