Tanya's Island (1980)

Tanya (D.D. Winters), a drop-dead-gorgeous model, lives with violently mercurial artist Lobo (Richard Sargent -- not to be confused with Dick Sargent from Bewitched). Subjected to Lobo's constant abuse, Tanya dreams of escaping to a desert island. Her imagination seemingly knows no bound; once she's reached her fantasy island, Tanya is befriended by a blue-eyed ape. It gets better -- Lobo, making a guest appearance in Tanya's dream, locks the poor girl in a cage, then begins behaving like an ape himself. How could you have missed this one? ~ Hal Erickson, Rovi