Guest Stars Juliet Stevenson as Carol Fiona Button as Lucy Cariad Lloyd as Scoopy Tom Stuart as Stefan Cash Holland as Luna Amelia Streeks as Marie Adrian Edmondson as Lewis Sean Gilder as Simon Jumayn Hunter as Jim Navin Chowdhry as Steve Alexis Rodney voices Additional Voices Charlotte Green as Model Woman Peter Burrows as Darwin George Montague as Crew Member Kalifa Macauley as Eve Cedric Ilunga as Adam Steen Raskopoulos as Imaginary Brother