• 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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