Mathew Baynton Creator Simon Farnaby Julian Creator, Actor, Executive Producer Martha Howe-Douglas Fanny Creator, Actor, Executive Producer Jim Howick Creator Charlotte Ritchie Alison Actor Kiell Smith-Bynoe Mike Actor Jim Howick Pat Actor, Writer, Executive Producer Mathew Baynton Thomas Actor, Writer, Executive Producer Lolly Adefope Kitty Actor Ben Willbond Captain Actor, Executive Producer Katy Wix Mary Actor Laurence Rickard Robin the Caveman , Headless Humphrey's Head Actor, Executive Producer Raj Ghatak Martin Actor Isabella Laughland Clare Actor Neil Edmond Icar Actor Bronwyn James Sam Actor Simon Kane Keith Darren Dean Actor Paul Ryan Alan Actor Tom Kingsley Director Matthew Mulot Producer Alison Carpenter Executive Producer Imogen Cooper Executive Producer Debra Hayward Executive Producer Alison Owen Executive Producer