Charlotte Ritchie Alison Actor Kiell Smith-Bynoe Mike Actor Martha Howe-Douglas Lady Button , Plague Victim Actor Mathew Baynton Thomas Thorne , Plague Victim Actor, Writer Simon Farnaby Julian , Plague Victim Actor Jim Howick Pat , Plague Victim Actor, Writer Laurence Rickard Robin the Caveman , Plague Victim , Headless Humphrey's Head Actor Ben Willbond The Captain , Plague Victim Actor Lolly Adefope Kitty , Plague Victim Actor Katy Wix Mary , Plague Victim Actor Simon Hynd Director Pat Tookey-Dickson Producer