Digimon: Digital Monsters - Season 1 - Eps 23: WereGarurumon's Diner
Matt finds Joe working at Digitamamon's diner to pay off his debt and agrees to help. DemiDevimon bribes Digitamamon to keep them while setting off accidents that makes Matt question Joe. However, once Digitamamon's scheme is exposed, they battle him with Tai and T.K. Joe sacrifices himself to save T.K., leading Matt to see him as a true friend and allowing Garurumon to Digivolve into WereGarurumon. After Digitamamon's defeat, the group splits up and continue their search for the remaining DigiDestined.
About Digimon: Digital Monsters

Title: Digimon: Digital Monsters
First Air Date: 1999-03-07
Last Air Date: 2001-03-25
Status: Ended
Rating: 8.1/10 (from 845 votes)
Language: JA
Seasons: 2
Total Episodes: 104
Network: Fuji TV
Genres: Animation, Action & Adventure, Sci-Fi & Fantasy, Kids
Production Companies: Toei Animation, Toei Company
Synopsis
While at summer camp, seven kids are transported to a strange digital world. In this new world they make friends with creatures that call themselves Digimon who were born to defend their world from various evil forces.
Cast

Reiko Kiuchi
Daisuke Motomiya (voice)

Megumi Urawa
Iori Hida / Armadimon (voice)

Rio Natsuki
Miyako Inoue (voice)

Hiroaki Hirata
Takeru Takaishi (voice)

Romi Park
Ken Ichijouji / Digimon Kaiser (voice)

Junko Noda
V-mon (voice)

Kae Araki
Hikari Yagami (voice)

Koichi Tochika
Hawkmon (voice)

Miwa Matsumoto
Patamon (voice)

Naozumi Takahashi
Wormmon (voice)