Characters played by Don Herbert
Mr. Wizard
Characters played by Bruce Lindgren
Wally
Characters played by Alan Howard
Alan
Characters played by Rita Walter
Rita
Characters played by Susan Levin
Betsy
Characters played by Benedict Herrman
[no data]
Characters played by Irene Strom
[no data]
Characters played by Betty Sue Albert
Betty Sue
Characters played by Bruce Podewell
Buzz
Characters played by Edmund Gaynes
Billy
Eddie (1955-1959)
Characters played by Stanley Crochowski
Jimmy
Characters played by Hugh Dunne
Tommy
Characters played by Pamela Fitzmaurice
Susan
Characters played by Ralph Robertson
Mike