Rule one: Never talk about Fight Club.

A female spin-off to the 1999 cult-classic by director David Fincher titled Fight Valley is reportedly in the works, according to multiple reports, and is set to star top female Ultimate Fighting Championship (UFC) bantamweights Holly Holm and Miesha Tate.

Holm's longtime boxing promoter Lenny Fresquez confirmed with The Albuquerque Journal that his fighter and Tate would be appearing in the movie, which is set to begin production in August.

The two top contenders are on the rise. "Cupcake" is a winner of three-straight bouts, most recently capturing a gritty victory over former 135-pound title challenger Sara McMann. Tate now has her sights set on No. 5-ranked bantamweight Jessica Eye. Meanwhile, Holm's hype-train picked up some steam after a testy, but encouraging, split-decision win over Raquel Pennington at UFC 184 in her Octagon debut.

When the women eventually make it onto set later this year, they may likely be joined by another female mixed martial arts (MMA) giant. Director of Photography Michael Lucas says Holm and Tate could be joined by current Invicta FC featherweight titleholder Cris "Cyborg" Justino.

Let's hope that they don't start fighting early!

According to the report, the storyline for the pending bare-knuckle blockbuster Fight Valley is "basically about an underground fighting circuit where women go to settle their differences." Further, "when a character in the film enters the fray and subsequently dies, her sister comes to investigate and winds up infiltrating the circuit."