Dr. Caroline Todd

Tamsin Greig

Dr. Angela Hunter

Sarah Alexander

Dr. Guy Secretan

Stephen Mangan

Boyce

Oliver Chris

Just a Man / —

Nick Frost

Sue White

Michelle Gomez

Dr. `Mac' Macartney

Julian Rhind-Tutt

Joanna Clore

Pippa Haywood

Kim Alabaster

Sally Bretton

Alan Statham

Mark Heap

Martin Dear

Karl Theobald

Dr. Martin Dear

Karl Theobold

Rachel

Katie Lyons

Lab Technicianian

Stephen Merchant

Karen Ball

Lucinda Raikes

Harriet Schulenberg

Olivia Colman

Holly

Sally Phillips

Paterson Joseph

Guest Star

Oliver Milburn

Guest Star

Daisy Haggard

Guest Star

John Oliver

Jake

Darren Boyd

Keir Charles

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Rosie Cavaliero