Spellbinder. It featured Jason Bates (David Hoflin, right) and his brother Brett (Jeffrey Walker, left), who move to an underwater research facility called ORCA, off the coast of Queensland, with their mother, a whale specialist.
They befriend the mysterious Neri (Marzena Godecki), who has super powers, an affinity for the ocean, and a pet whale.
Then they found the crashed ship with some survivors in suspended animation, notably the pilot's son, Kal (Jeremy Angerson), who apparently zapped through space without wearing a shirt.
Before the series ended, Neri and her Scooby Team were globetrotting, time traveling to ancient Egypt, and even exploring the home planet of Ocean World.
Flipper. Not to mention the ever-changing adult and teenage crew members of the ORCA.
No gay characters, but minimal heterosexual entanglements. Jason is sweet on Neri, eventually kissing her, but Kal seems more interested in Jason, and Brett doesn't express much romantic interest at all.
As the seasons passed, David Hoflin developed a stunning bodybuilder's physique, which he showed off frequently, even after the series ended. He has been featured on the Flipper tv series, The Lost World, Head Start, Neighbours, Alcatraz, and NCIS.