Riverdale reaches a huge milestone tonight: “Chapter One Hundred: The Jughead Paradox.” That’s right, episode 6×05 will serve as both the series’ 100th episode and the final episode of Riverdale‘s special five-episode event, Rivervale! It airs at 9/8c on The CW.

100th EPISODE — Unnerved by a series of strange happenings around him, Jughead’s (Cole Sprouse) quest for answers leads him to uncover the truth about Rivervale. KJ Apa, Lili Reinhart, Camila Mendes, Madelaine Petsch, Mädchen Amick, Casey Cott, Vanessa Morgan, Charles Melton, Erinn Westbrook and Drew Ray Tanner also star.

In this exclusive clip, we see Jughead (Cole Sprouse) join everyone in the teachers’ lounge. He is clearly confused to hear that Betty (Lili Reinhart) and Archie (KJ Apa) are supposed to get married this weekend, not to mention he’s going to be Archie’s best man. Betty then gets a call from Dr. Curdle, who claims to have Jughead’s corpse, but she tells him that’s not possible since Jughead is currently with her.

Watch the full clip below:

Riverdale will return with new episodes of season six on Sunday, March 6.