The episode is based on the stories "The Crystal Egg" and "The Remarkable Case of Davidson's Eyes"
Eve Best
Ellen McGillvray
Tom Ward
H.G. Wells
Katy Carmichael
Jane Robbins
Nicholas Rowe
Professor Cedric Gibberne
Matthew Cottle
Whittaker
Barry Stanton
Dean Frederick Masterman
Mark Lewis Jones
Arthur Brownlow
Pip Torrens
Mark Pattison
Tim Potter
Jim
Orlando Seale
Albert Einstein
Ruth Sheen
Mrs. MacMananan
Dominic Cooper
Sidney Davidson
