第 1 季 共 13 集
播出时间：1977年9月23日
第 1 集 Melt Down
播出时间：1977年9月23日
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.
第 2 集 The Mudworm
播出时间：1977年10月14日
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.
第 3 集 The Hawk of Mu
播出时间：1977年10月19日
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 Mark must prevent him from taking it.
第 4 集 Giant
播出时间：1977年10月26日
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 has already stolen gold from one of them.
第 5 集 Man O' War
播出时间：1977年11月2日
Schubert threatens to cause worldwide flooding by using powerful microwaves to melt the earth's polar ice caps, unless the government turns Mark Harris over to him.
第 6 集 Shoot-Out at Land's End
播出时间：1977年11月9日
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
第 7 集 Crystal Water, Sudden Death
播出时间：1977年11月23日
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 Mark must prevent him from taking it.
第 8 集 The Naked Montague
播出时间：1977年12月7日
The oceans are leaking through a fissure in the ocean floor. A conman named Muldoon agrees to guide Mark through the fissure to investigate. However, Mark is unaware that giants inhabit the other side of the fissure and Muldoon has already stolen gold from one of them.
第 9 集 C.W. Hyde
播出时间：1977年12月14日
Using his genetic scientists, Schubert produces a giant jellyfish which he intends to release unless his extortion demands are met.
第 10 集 Scavenger Hunt
播出时间：1978年4月19日
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 Billy had the same webbing as Mark but has had it removed.
第 11 集 Imp
播出时间：1978年4月26日
Schubert attempts to make a satellite weapon to knock out the Earth's communications. However, to power the weapon he needs the energy crystals protected by a forcefield under the ocean. The crystals actually power the forcefield that protects an underwater city.
第 12 集 The Siren
播出时间：1978年5月3日
An underwater landslide transports Mark to Verona, Italy... in the days of Romeo and Juliet.
第 13 集 Deadly Carnival
播出时间：1978年6月7日
C.W. develops a Jekyll-and-Hyde personality after swallowing a mysterious liquid.
