His theatre credits include: William Marshall, Earl of Pembroke in "King John" by William Shakespeare , directed by Michael Benthall (Old Vic Theatre, London, 1953)
He once lost a lead film part because the producer felt Dearth bore too close a resemblance to James Mason. Barry Letts stated on the DVD commentary of "Planet of the Spiders" that this experience embittered him for the rest of his life.
