Episode 16 of "Angel"
s01e16 The Ring

As Wesley and Cordelia exchange banter, Angel is paid a visit by a strange man, claiming his brother Jack was kidnapped by demons affiliated with a bookie. While Cordy and Wesley consult their demon database, Angel pays a visit to the bookie. The bookie refers him to a place in beechwood canyon. Angel goes to the canyon and gets information from the bookie, then begins investigating an underground fight club. We later learn the man who pays a visit to Angel, is the organizer of the fight club, and Wolfram and Hart is a major sponsor. Angel soon discovers he was set up in a trap. He is expected to fight other slave demons to the death. The next morning, after Cordelia and Wesley get suspicious about Angel's whereabouts, Wesley pays a visit to the bookie and obtains the address of the fight club. That night, Angel kills a demon, but his heart isn't into the battle. Wesley and Cordelia spot him in the ring, and Wesley explains the meaning behind the slave bracelets which Angel and the other demons are wearing. They rush back to AI to find a way to open the bracelets. Meanwhile, Jack pays a visit to Angel and tells him of his disappointment in his fighting and Angel threatens to kill him unless the slaves are set free. His brother decides to kill Jack, rather than agree to Angel's terms. Angel is knocked out, and later wakes up in the offices of Wolfram and Hart. When he finds out the associate from W&H has ulterior motives, he returns to the fight club and learns his next opponent is Trepkos, the toughest demon in the lot. The next morning, Wesley and Cordelia successfully make a key to unlock the bracelets. That evening, Angel begins to fight Trepkos. The battle is brutal. Cordelia and Wesley break into the slave area with the special key, but it falls into the hands of one of the demons. While Angel and Trepkos continue to fight, the demons set themselves free. After Angel has the opportunity to kill Trepkos, but doesn't take it, Trepkos walks away. The demons burst in and a giant battle ensues. One of the demons slips a bracelet onto the fight's organizer, Trepkos throws him into the air,and he promptly disintegrates. The demons are set free.