Patrick Duffy
Mark Harris
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Cast
Episode Guide
- 1. Melt Down Sep 22, 1977
- Mr. Schubert threatens to flood the world.
- 2. The Mudworm Oct 13, 1977
- A machine mines minerals from the sea floor.
- 3. Hawk of Mu Oct 18, 1977
- Mark finds artifacts in an underwater cavern.
