The game - Fathom - Intellivision | INTV

The daughter of Neptune, was caught and imprisoned off the coast of the sea. And some Titans imprisoned her. Your mission is to save her by locating the magical trident. You can take the form of a dolphin or a bird. Touch all the clouds and find the part of the trident. You will find another part touching the seahorses in the guise of a dolphin. But be afraid of other birds and octopuses with sharks!

In general, words are one thing, but in reality it is quite another. Not a very (in my opinion) successful toy, so play if you are interested.

Also was on Atari 2600, ColecoVision, TI-99/4A.