Total Seasons :1Total Episodes : 13
Atlantis survivor Mark Harris breathes underwater, withstands extreme depth pressures and wields superhuman strength.
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.
Air Date : 1977-09-22
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.
Air Date : 1977-10-13
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.
Air Date : 1977-10-18
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.
Air Date : 1977-10-25
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.
Air Date : 1977-11-01
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
Air Date : 1977-11-08
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.
Air Date : 1977-11-22
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.
Air Date : 1977-12-06
Using his genetic scientists, Schubert produces a giant jellyfish which he intends to release unless his extortion demands are met.
Air Date : 1977-12-13
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.
Air Date : 1978-04-18
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.
Air Date : 1978-04-25
An underwater landslide transports Mark to Verona, Italy... in the days of Romeo and Juliet.
Air Date : 1978-05-02
C.W. develops a Jekyll-and-Hyde personality after swallowing a mysterious liquid.
Air Date : 1978-06-06
(Mark Harris)
(Dr. Elizabeth Merrill)
(Dr. Crawford)
(Brent)
(Cetacean crew (as J. Victor Lopez))
(Cetacean crew)
(Cetacean crew)
(Mr. Schubert)
(Jack Muldoon)
( - )
(Blaise Mullen)
(Clint Hollister)
(Havergal)
(Lew)
(Moby)
(Hugh Trevanian)
(Charlene Baker)
(Vicki)
(Canja)
(Thark)
(Dashki)
(Artemus Washburn)
(Romeo)
(Belle)
(Stringer)
(Moxie)
(Juliet)
(Caine)
(Summersday)
(Mercutio)
(Hot Dog Stand Owner (as Dee Wallace-Stone))
(Juliette Schubert (as Vicky Huxtable))
(Cetacean crew (as J. Victor Lopez))
(Carla(as Tasha Martell))
(Bettina Washburn (as Jamie Smith Jackson))
(Louisa)
(Bert Davis)
(Clavius)
(Duke (as Dick Gautier))
(Buddy O'Toole)
(Amanda Trevanian)
(Jenny Reynolds (as Lisa Richards))
(Siren)
(Student)