Stars (in credits order)
Wilfrid Grantham
The Lepidopterist
Edmund Willard
The Tramp
Pamela Standish
The Chrysalis
Frank Birch
Mr. Beetle
Maire O'Neill
Mrs. Beetle
Charles Peters
Robber Beetle
Rupert Bruce Lockhart
The Ichneumon Fly
Sheila Kay
The Larva
Leslie French
Mr. Cricket
Wendy Toye
Mrs. Cricket
Geoffrey Wincott
The Parasite
Wilfred Franks
The Blind Ant Timekeeper
George Hayes
Chief Engineer
John Boxer
Second Engineer
Douglas Allen
Messenger
Bruce Adams
Signal Officer
Charlotte Bidmead
The Butterflies and Moths
Celia Franca
Anne Gee
Elizabeth Hamilton
Mary Hatton
Anthony Kelly
Hugh Laing
Belinda Smith
Thérèse Langfield
Alec Raysman
Susan Reeves
Brenda Seth
Eric Blankley
Ant
Joseph Chelton
John Coast
Philip Cook
Edward Coventry
George Gower
Tom Hammerton
John Hayden
Roy Henderson
Gordon Hewitt
Michael Hodgkinson
Leonard Michel
Barry Nuthall
Ed Somerset
Gilbert Spurge
John Stamp
George Sturrock
Leo Worth
Ruthhanna Boris