Mathew Baynton Thomas Thorne , Plague Victim Creator, Actor, Executive Producer Simon Farnaby Julian , Plague Victim Creator, Actor, Executive Producer Martha Howe-Douglas Lady Button , Plague Victim Creator, Actor, Executive Producer Jim Howick Pat , Plague Victim Creator, Actor, Executive Producer Laurence Rickard Robin the Caveman , Plague Victim , Headless Humphrey's Head Creator, Actor, Executive Producer Ben Willbond The Captain , Plague Victim Creator, Actor, Executive Producer, Writer Charlotte Ritchie Alison Actor Kiell Smith-Bynoe Mike Actor Lolly Adefope Kitty , Plague Victim Actor Katy Wix Mary , Plague Victim Actor Steve Oram Terry Actor Ethan Alston Colin Actor Tom Grey Keith Actor Tim Plester Wixy Actor Patrick Adams Kevin Actor Alison Carpenter Executive Producer Kate Daughton Executive Producer Debra Hayward Executive Producer Alison Owen Executive Producer Matthew Mulot Producer Tom Kingsley Director