Buck Douglas, the famous "Alien Quest" TV show host visits Pontypandy and everyone in town searches for aliens.
| Actor | Role |
|---|---|
 Steven KynmanFireman Sam / Norman Price (voice) | Fireman Sam / Norman Price (voice) |
 David CarlingTom Thomas / Station Officer Steele / Trevor Evans / Mike Flood | Tom Thomas / Station Officer Steele / Trevor Evans / Mike Flood |
 Su DouglasDylis Price / Mandy Flood / Helen Flood | Dylis Price / Mandy Flood / Helen Flood |
| JJohn HaslerArnold McKinley / James Jones | Arnold McKinley / James Jones |
| HHarriet KershawBella Lasagne / Ellie Philips (voice) | Bella Lasagne / Ellie Philips (voice) |
| AAlex LoweJoe Sparkes / Ben Hooper (voice) | Joe Sparkes / Ben Hooper (voice) |
 Nigel WhitmeyMoose Roberts (voice) | Moose Roberts (voice) |
 Jo WyattLizzie Sparkes / Hannah Sparkes (voice) | Lizzie Sparkes / Hannah Sparkes (voice) |
 David TennantBuck Douglas (voice) | Buck Douglas (voice) |
| TTegwen TuckerPenny / Sarah / Bronwyn / Mrs. Chen (voice) | Penny / Sarah / Bronwyn / Mrs. Chen (voice) |