When old enemies return, longtime rivals have to join forces.

On Thursday, Netflix debuted the official trailer for “Cobra Kai” season 4, which sees Ralph Macho’s Daniel LaRusso and William Zabka’s Johnny Lawrence putting their differences aside for a greater cause.

READ MORE: ‘Cobra Kai’ Reveals The Premiere Date For Season 4: Watch The Latest Teaser

Martin Kove and Thomas Ian Griffith – Photo: Netflix © 2021
Martin Kove and Thomas Ian Griffith – Photo: Netflix © 2021

With the Miyagi-Do and Eagle Fang dojo’s working together, Cobra Kai leader Kreese calls in his old friend Terry Silver, played by Thomas Ian Griffith, who previously starred as the main antagonist in “The Karate Kid Part III”.

Ralph Macchio and William Zabka – Photo: Curtis Bond Baker/Netflix © 2021
Ralph Macchio and William Zabka – Photo: Curtis Bond Baker/Netflix © 2021

“I just want to make sure this time we win,” Terry says in the trailer, while Johnny and Daniel plot how they’re going to defeat him.

READ MORE: ‘Cobra Kai’ Fan Andrew Garfield Gets A Huge Surprise From The Show’s Cast

Ralph Macchio and Griffin Santopietro "Cobra Kai"
Ralph Macchio and Griffin Santopietro – Photo: Curtis Bond Baker/Netflix © 2021 — Photo: Curtis Bond Baker/Netflix © 2021

“We’ll settle this on the mat,” one of the students says, referring to All-Valley Tournament where the big face-off is set to go down.

Ralph Macchio and William Zabka – Photo: Netflix © 2021
Ralph Macchio and William Zabka – Photo: Netflix © 2021

“Cobra Kai” season 4 premieres Dec. 31.