Mathew Baynton Thomas Thorne , Plague Victim Creator, Actor, Executive Producer, Writer 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, Writer 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 Charlotte Ritchie Alison Actor Kiell Smith-Bynoe Mike Actor Lolly Adefope Kitty , Plague Victim Actor Katy Wix Mary , Plague Victim Actor Yani Aleksandrov Headless Humphrey's Body Actor Caoilfhionn Dunne Director Actor Richard Thomson First Ad Adam Actor Caroline Guthrie Cathy Make-Up Actor Rory Fleck Byrne Toby Nightingale Actor Elisabeth Hopper Miss Jane Actor Tom Mackley Manservant Actor Nicholas A. Newman Sound Guy Actor John Omole Best Boy Actor Alison Carpenter Executive Producer Kate Daughton Executive Producer Debra Hayward Executive Producer Alison Owen Executive Producer Matthew Mulot Producer Tom Kingsley Director