The Fantastic Journey S01 E03 Beyond the Mountain

The travelers are separated by a red cloud which leaves Liana as the 'guest' of Jonathan Willoway, who is the master of a utopian community of golden-garbed androids, and the others trapped in a dark swamp surrounded by green-skinned humanoids. Willoway tries to convince Liana to marry him while Fred's medical skills prove invaluable in discovering the truth.