MMA World Series of Fighting is back in action Saturday night for WSOF 24, one of their biggest events of the year — featuring a welterweight bout between Yushin Okami and Jon Fitch.

They look to keep the momentum next month with a special one-night lightweight tournament at WSOF 25 in Arizona.

But the promotion has more in store for 2015, including the return of one of MMA’s most feared strikers at their just-announced WSOF 26 event, scheduled for Decembar 19 in Las Vegas.

Light heavyweight Tyrone Spong, who amassed a 74-7-1 record in kickboxing, including 46 knockouts before making the switch to MMA, will return to action at WSOF 26, according to a WSOF press release. Spong, a native of Suriname who trains with the Blackzilians camp in Boca Raton, Florida, is 2-0 in MMA.

His opponent is said to be determined at a later date, but the release included a graphic which implies he will face Jake Heun. Heun, of Alaska, is 8-4 in MMA — including a submission win in his last bout, a victory over Davin Clark at WSOF 22.

Also returning at WSOF 26 is Lance Palmer, the promotion’s featherweight champion. Palmer, who trains with Team Alpha Male in California and is 10-1 in MMA, is currently riding a three fight win streak. On December 19, he will face the winner of Saturday’s bout between Alexandre Almeida (16-5) of Manaus, Brazil and Saul Almeida (18-5) of Boston, Mass.

“We are looking forward to making our debut at one of the finest venues in the fight capital of the world, and to another historic night of MMA action with the return of both Tyrone Spong, one of the sport’s hottest commodities, and Lance Palmer, a prolific world champion,” said World Series of Fighting President Ray Sefo.

WSOF 26 will take place at the Chelsea inside The Cosmopolitan of Las Vegas on Friday, Dec 19. The event will be televised on NBCSN.