New details have leaked online about the fourth episode in How I Met Your Mother's ninth and final season.

A synopsis was leaked online, according to the International Business Times.

Episode 4, previously revealed to be titled The Broken Code, could actually spell the end of Barney and Ted's friendship.

It is in the fourth episode that Barney will learn that Ted still has unresolved feelings for Robin, according to breathecast.com.

Barney, who understandably doesn't take the news well, will take his frustrations out on Ted during the Best Man poker game. Marshall, who is still trying to get back in time for the wedding, will be forced to mediate and help settle the dispute between the two over a Skype call-but will it be too little too late?

The leaked synopsis does not give that detail.

Another leak for the fourth episode includes a photo of a special guest star. Tim Gunn, of Project Runway, will be guest-starring in the episode and playing in Barney's poker game.

See Related: 'How I Met Your Mother' Season 9 Spoilers: William Zabka Returning for eight episodes As Barney's friend? [VIDEO]

Again, there's no confirmation on just how he winds up there.

How I Met Your Mother premieres Monday Sep. 23 at 8:00 p.m. on CBS.