During the first season of “Cobra Kai,” Eli “Hawk” Moskowitz (Jacob Bertrand) changes his appearance and personality after joining the Cobra Kai dojo, owned by Johnny Lawrence (William Zabka). The martial artist, who used to be a timid “Doctor Who” fan, becomes increasingly aggressive and harasses his former best friend, Demetri (Gianni Decenzo). In season 2, episode 5, Hawk vandalizes the Miyagi-Do Karate dojo owned by Daniel LaRusso (Ralph Macchio). His behavior only worsens during the show’s third season. He brutally beats up Brucks ( Bo Mitchell), who used to bully him, and later breaks Demetri’s arm. However, the teenager eventually regrets his past actions and manages to mend his friendship with Demetri. He also becomes a student at Daniel and Johnny’s joint dojo.