- Mr. Chips M.A. (Cantab.) as Big Bird
- Katherine as Abby Cadabby
- Dr. John Hamilton Wetherby D.D. (Cantab.) as Gordon
- Max Staeffel M.A. (Oxon.) as Bob
- John Colley, Peter Colley I, II and III as Bert, Ernie, Telly Monster, and Cookie Monster
- Peter Colley as an adult as Colambo
- Sir John Colley as Oscar the Grouch
- Perkins as Guy Smiley (uncredited)
- Mr. Jackson B.A. (Cantab.) as Murray Monster
- Wainwright as Elmo
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