Bob Angelini

Lab Tech

Bern Cohen

Dr. William Lemmon

Reagan Leonard

Stephanie LaFarge

Nim Chimpsky

Self (archive footage)

Stephanie LaFarge

Self

Herbert Terrace

Self

Wer LaFarge

Self (archive footage)

Jenny Lee

Self

Laura-Ann Petitto

Self

Bill Tynan

Self

Joyce Butler

Self

Renne Falitz

Self

Bob Ingersoll

Self

Alyce Moore

Self

James Mahoney

Self (as Dr. James Mahoney)

Henry Herrmann

Self

Cleveland Amory

Self (archive footage)

Marion Probst

Self

Chris Byrne

Self

Anna May Marsh

Signing Girl: re-enactment unit

Sarah Sakaan

Renee Falitz: re-enactment unit

Dennis Lauricella

Beefy Guy: re-enactment unit

Robert Nesi

Beefy Guy: re-enactment unit (as Robert J. Nesi)

Scarlett Bermingham

Laura-Ann Petitto: re-enactment unit

Mike Devoe

Mike Devoe

Michael S. LePera

Wer LaFarge: re-enactment unit (as Michael LePera)

Peter Elliott

Nim Cimpsky - Reenactment Unit (uncredited)