The Big Cube is a 1969 Warner Bros. thriller directed by Tito Davison and starring Lana Turner, Karin Mossberg, George Chakiris, Daniel OHerlihy and Richard Egan it was one of Lana Turners last movies. It is notable for its aggressive portrayal of LSD use and the 1960s youth counterculture as vicious evils.
Charles is killed in a boating accident, which also leads to Adriana suffering from a concussion. Lisas new boyfriend Johnny Allen George Chakiris, a womanizing, fortunehunting medical student, capitalizes on that distrust to persuade Lisa that her fathers death was murder, a charge exacerbated by Adrianas threatas per her late husbands instructions as laid out in his will, for which Adriana is executorto disinherit Lisa if she marries Johnny.Johnny conspires with Lisa to lace Adrianas prescribed sedatives with enough LSD to drive her insane. In addition, while Adriana is having LSDinduced hallucinations, they plan on playing prerecorded subliminal messages to further drive her crazy. ........
Source: Wikipedia