Mark goes undercover to investigate members of a carnival planning to break into a museum. The only way to break into the museum is through an underwater tunnel, through which only Mark can swim. When he is approached, he refuses. The owner of the carnival is then kidnapped and threatened unless Mark helps.
- Directed by
- Dennis Donnelly
- Written by
- Larry Alexander
Guest stars
All episodes — Season 1
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S1 E1Melt Down
Sep 22, 197749 min
Schubert threatens to cause worldwide flooding by using powerful microwaves to melt Earth's polar ice caps, unless the government turns Mark Harris over to him.
S1 E2The Mudworm
Oct 13, 197749 min
When a multimillion-dollar underwater probe malfunctions and begins attacking any ship that travels near it, Mark must reason with its highly advanced brain and convince it to stop.
S1 E3The Hawk of Mu
Oct 18, 197748 min
Mark, investigating a power outage, discovers a centuries-old hawk statue from the legendary civilization of Mu. The statue, when used properly, can remove the power from a large area. Schubert discovers the power of the hawk statue and Mar
S1 E4Giant
Oct 25, 197748 min
The oceans are leaking through a fissure in the ocean floor. A con-man named Muldoon agrees to guide Mark through the fissure to investigate. However, Mark is unaware either that giants inhabit the other side of the fissure or that Muldoon
S1 E5Man O' War
Nov 1, 197748 min
Using his genetic scientists, Schubert produces a giant jellyfish which he intends to release unless his extortion demands are met.
S1 E6Shoot-Out at Land's End
Nov 8, 197748 min
Mark is somehow linked with a man named Billy, existing in a wild west town, who appears to be his twin. Investigating, Mark arrives in the town and discovers that Billy once had the same webbing as Mark, but also that he has had it removed