Roger Corman directed this psychedelic odyssey concerning the curative properties of LSD, with a surrealistic screenplay written by Jack Nicholson. Peter Fonda is Paul Groves, a television commercial director whose estranged wife Sally (Susan Strasberg) is pressuring him to sign their divorce papers.
Feeling strain in both his professional and his personal life, Paul talks to a guru named John (Bruce Dern), who suggests that an acid trip will cure what ails him. Paul goes to John's pad and his trip begins -- at first calm and sedate, but when Sally and a sexy blonde hippie enter his hallucinations, it's every man for himself.
Paul experiences crazed sexual couplings, paranoiac visions, and even gets to attend his own funeral. After imagining he's seeing John's head bashed in, he runs from the apartment in terror and takes to the streets. He is finally rescued and brought to a beach house, where he completes his trip while making love to a beautiful woman.
After the trip subsides, Paul is convinced he has been reborn and is prepared to face the new day.