Ali Larter's fiance bashes her head with a club! (Relax, it's only a movie.)

By Elizabeth Snead

May 13, 2008 2:22 PM ET

Wanna see "Heroes" hottie Ali Larter's fiancÃ©, Hayes MacArthur, bash her in the head with a club and have sex with her?

OK, it's only implied sex, but the clubbing is a go. Plus, Larter wears nothing but little bits of fur, sticks and bones. And hair extensions.

Then you'll enjoy "Homo Erectus," writer/director Adam Rifkin's hilarious new National Lampoon comedy about Ishbo, a confused, insecure, philosophical Jewish cave nebbish who thinks there must be more to prehistoric life than throwing spears, hunting dinosaurs and clubbing women.

Larter actually met her fiance on the "Erectus" set, so clearly all that clubbing paid off. MacArthur has had some small film and TV roles (a doorman in "Curb Your Enthusiasm," Curt "Ironman" Irons in "How I Met Your Mother").

In "Erectus," he plays Thudnik, the jock brother of Ishbo (Rifkin) who's secretly in love with Fardart (Larter). Naturally, Fardart has the hots for Ishbo's hunky but dumb brother. Ah, the eternal triangle.

Rifkin has captured the self-obsessed neurosis, romantic longing, universal questioning, comedic pratfalls and deadpan delivery of a young Woody Allen ("Everything You Always Wanted to Know About Sex," "Sleeper").

If "Homo Erectus" feels inspired by Allen's schtick, it's not without the maestro's blessing. The two writer/directors have met, and there was talk of having Allen do a cameo as a caveman who literally hands Ishbo (Adam) "the torch." It didn't happen due to scheduling, but it would have been an appropriate touch.

The film, due out nationally June 13, also stars David Carradine, Talia Shire, Ron Jeremy, Carol Alt, Tom Arnold as the first gay caveman and the usually incomprehensible Gary Busey as the be-feathered, out-there leader of a neighboring warrior tribe, who has a fatal flaw. I can say no more. Watch the trailer.