Characters played by Alexander Armstrong
Tannoy
Characters played by Tom Bell
Bob
Characters played by Letty Butler
Lucy
Characters played by Jason Forbes
Junior
Charles Drew
Characters played by Eleanor Lawrence
Professor Small
Marie Curie
Rita Levi-Montalcini
Characters played by Chris Martin
Mark
Characters played by Ben Miller
McTaggart
Edward Jenner
Thomas Malthus
Characters played by Susan Wokoma
Dr. Sensible
Characters played by Marcus Garvey
Galileo
Louis Pasteur
Theophrastus
Characters played by David Armand
Alexander Bell
Characters played by Thom Tuck
Robert Hooke