Antidote

Conan and his companions help queen Vita return from their imposed exile in a cave. They must fight against a sea-monster, which is controlled by a Magier, but when the queen leaves the cave. Conan finds out that the Magier works for Hissah Zul. Conan defeats it, kills the sea-monster and guarantees that the daughter of the queen is appointed her successor.

Antidote is also found on...

Full List of Conan the Adventurer Episodes