Sylvester Stallone is working on another Expendables movie

Sylvester Stallone is working on another Expendables movie. However, the actor didn't drop the news in an interview. Nor did a studio share the information. Stallone confirmed it himself, wholly unsolicited, on his own social media channels.

The promise of a fourth film comes five years after the last Expendables movie was released, with the franchise having already nabbed just about every action movie star imaginable already.

"All of those 4th of July fireworks got my mind going," Stallone wrote on an Instagram post. "I am starting to cook up the next adventure!" The caption accompanied a photo featuring Stallone as his Expendables character, Barney Ross.

The Expendables franchise was launched with the first film in 2010. Rounding up action movie megastars like Stallone, Jason Statham, Jet Li, Dolph Lundgren, Eric Roberts, Randy Coutore, Stone Cold Steve Austin, Terry Crews, Bruce Willis, and Arnold Shwarzenegger, the title became an instant point of interest for fans. Sequels then followed in 2012 and 2014, and rumors of a female-led equivalent expansion came and went without coming to fruition.