Buck Douglas, the famous "Alien Quest" TV show host visits Pontypandy and everyone in town searches for aliens.
Steven Kynman
as Fireman Sam / Norman Price
David Carling
as Tom Thomas / Station Officer Steele / Trevor Evans / Mike Flood
Su Douglas
as Dylis Price / Mandy Flood / Helen Flood
John Hasler
as Arnold McKinley / James Jones
Harriet Kershaw
as Bella Lasagne / Ellie Philips (voice)
Alex Lowe
as Joe Sparkes / Ben Hooper (voice)
Nigel Whitmey
as Moose Roberts (voice)
Jo Wyatt
as Lizzie Sparkes / Hannah Sparkes (voice)
David Tennant
as Buck Douglas (voice)
Tegwen Tucker
as Penny / Sarah / Bronwyn / Mrs. Chen (voice)
