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"The Secret of Lost Valley" is a 1980 telefilm produced by Walt Disney Productions. It was originally broadcast on NBC as a two-part episode on Disney's Wonderful World on April 27, and May 4, 1980. The telefilm was directed by Vic Morrow.
- Jackson Bostwick
- Gary Collins ... Ned Harkness
- John Lupton
- Eddie Marquez ... Zane
- Mary Ann Mobley ... Susan Harkness
- Brad Savage
- Tom Simcox
- Barry Sullivan