What episode in did Isaac come in in teen wolf?

Isaac Lahey, portrayed by Daniel Sharman, first appears in "Teen Wolf" during Season 3, Episode 1, titled "Tattoo." He is introduced as a new character and a member of the Beacon Hills Lacrosse team, becoming part of the main cast as the season progresses. His character adds depth to the storyline, particularly through his interactions with Scott and the other werewolves.