
The film chronicles the lives of the elite as they fly first‑class, dine in the finest restaurants, broker astonishing deals, and indulge in scandalous affairs. An over‑the‑hill movie producer marries a wealthy, spiteful woman and a closeted lesbian simply to appease his spoiled daughter. In retaliation, she seduces a rich playboy and a local screenwriter, sparking a tangled web of desire and deceit.
Does Once Is Not Enough have end credit scenes?
No!
Once Is Not Enough does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of Once Is Not Enough, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

John Roper
Franco

Kirk Douglas
Mike Wayne

Brenda Vaccaro
Linda

Lillian Randolph
Mabel

Alexis Smith
Deidre Milford Granger

Renata Vanni
Maria

George Hamilton
David Milford

Deborah Raffin
January

David Janssen
Tom Colt

Leonard Sachs
Dr. Peterson

Phil Foster
Cab Driver

Gary Conway
Hugh

Mark Roberts
Rheingold

Tony Ferrara
Beautiful People

Kelly Lange
Weather Lady

Sig Frohlich
Waiter

Jim Boles
Scotty

Tony Regan
Bar Patron (uncredited)

Ethelreda Leopold
Club Patron (uncredited)

Melina Mercouri
Karla

Trudy Marshall
Myrna

Norman Stevans
Bar Patron (uncredited)

Eddie Garrett
Maitre d' at Polo Lounge

Ann Marie Moelders
Girl at El Morocco

Maureen McCluskey
Beautiful People

Michael Millius
Beautiful People

Harley Farber
Beautiful People

Devi Morgan
Background (uncredited)
Discover where to watch Once Is Not Enough online, including streaming platforms, rental options, and official sources. Compare reviews, ratings, and in-depth movie information across sites like IMDb, TMDb, Wikipedia or JustWatch.
Challenge your knowledge of Once Is Not Enough with this fun and interactive movie quiz. Test yourself on key plot points, iconic characters, hidden details, and memorable moments to see how well you really know the film.
Which actor portrays the middle‑aged motion‑picture producer Mike Wayne?
Kirk Douglas
George Hamilton
David Janssen
Robert Redford
Show hint
Read the complete plot summary of Once Is Not Enough, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
Mike Wayne Kirk Douglas is a middle-aged motion-picture producer whose career has fallen on hard times, and he struggles to bring a new Hollywood project to life. Accustomed to a lavish lifestyle, he pampers his daughter January Deborah Raffin, giving her an expensive education in Europe and every luxury money can buy. When she returns to America, she longs to be close to her father, hoping to share in his world even as his professional fortunes waver.
Needing capital, Mike enters into a loveless marriage with Deidre Milford Granger Alexis Smith, one of the world’s wealthiest women who has already endured multiple marriages and insists on running things her own way. Deidre’s cold, arrogant presence weighs on the household, and she is secretly involved in a lesbian affair, a fact that wounds January and stirs trouble behind the scenes. Deidre tries to pull January toward her cousin David Milford George Hamilton, a charming but persistent ladies’ man who always seems to get his own way. He eventually persuades January to share a bed with him, only to discover that she is a virgin, complicating the fragile web of loyalties and desires surrounding the family.
Seeking guidance, January turns to Linda Riggs Brenda Vaccaro, an old friend now a free-spirited magazine editor who urges her to write a book and embrace a life of independence and exploration. Yet January finds herself drawn to Tom Colt David Janssen, a hard-drinking, aging novelist who is both witty and abrasive, and who becomes a staunch adversary of Mike’s worldview. Mike’s resentment simmers as he watches Colt become a powerful rival in January’s heart, and when he discovers them together in a Beverly Hills hotel cabin, he unleashes a furious punch at Colt, insisting that January must choose between her lover and her father.
The conflict escalates as Deidre’s demands and insults push Mike toward divorce, and the two agree to separate, only to meet a tragic fate when their airplane crashes, killing them both. The loss leaves January shattered, and she turns to Colt for consolation, only to find him turning away when she needs him most, leaving her to face the consequences of the wreckage alone.
In the wake of these upheavals, January learns that she has inherited $3 million from her father’s life insurance policy, a windfall that could help her forge a new path. She heads to share the news with Linda, only to discover that Linda has just been fired for having an affair with her boss, a stark reminder that no one escapes the compromises of adult life. Realizing that nothing in life is perfect, January wanders through Manhattan after dark, carrying a fragile hope that tomorrow might be better than today.
Compared to the source novel, the film offers a more hopeful ending for January. The original book concludes with a darker, more transgressive finale—January experimenting with acid, joining an orgy, and wandering to the beach where a hallucinatory encounter with her father ends in a presumed drowning. By contrast, the movie softens that conclusion, hinting at resilience and a future still open to possibility, even as it acknowledges the scars left by love, ambition, and wealth.
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