Jake Gyllenhaal made a surprise appearance at UFC 285 to film live fight scenes for his movie 'Roadhouse'

• Jake Gyllenhaal made a surprise appearance Saturday at UFC 285 in Las Vegas.
• Celebrities are often seen Octagonside, but Gyllenhaal was in the cage himself.

LAS VEGAS — Jake Gyllenhaal got a taste of a big fight week at two of the most iconic combat sports venues in Las Vegas as he filmed scenes for his upcoming movie "Roadhouse."

The Hollywood actor, who starred in Donnie Darko, Brokeback Mountain, and End of Watch, plays Elwood Dalton in Roadhouse, a film that focuses on an ex-UFC athlete who ends up working at a roadhouse in the Florida Keys.

Gyllenhaal invaded an official UFC weigh-in Insider and other reporters attended Friday at the MGM Grand Garden Arena to shoot a scene in which his character Dalton made weight. Gyllenhaal looked ripped on the scales.

On Saturday, UFC organizers paused its UFC 285 event at the T-Mobile Arena during the preliminary section of the show for a nearly 30-minute period to allow the Roadhouse film crew to capture footage for Dalton's early MMA career.

See Gyllenhaal's walk to the UFC Octagon here:

In the scenes, which were shot in front of a live audience, Gyllenhaal's Dalton got the big event treatment as Bruce Buffer introduced him to the crowd.

After the opening bell, Dalton then hammered his opponent into unconsciousness and had to be manhandled by the referee to stop the beating.

Watch the scene right here:

The fight scenes aren't the only time that UFC intersects with the film, as Roadhouse also stars Conor McGregor.

The Irish former two-weight UFC champion has already shot his scenes, and is now filming The Ultimate Fighter — an MMA reality TV series — opposite lightweight rival Michael Chandler.

This season's The Ultimate Fighter will culminate with a mega UFC event pitting McGregor against Chandler at a show later this year, possibly as early as September.