It wasn't in an episode, it was in the 4th movie, Fire on the Mystic Island.
Chat with our AI personalities
Whenever you first meet Sesshomaru in the 1st Season Jaken has been with Sesshomaru even before the series started. You do get to see a flashback Jaken has. He tells Rin about his first encounter with Lord Sesshomaru and why he is so loyal in Season 3 Episode 79: Jaken's Plan to Steal Tetsusaiga
Devils fight with god
The episode was "Stewie Kills Lois". Also, it's Rosie O'Donnell, not "O'Donald"
When he was repeating the 3rd grade
Allen becomes Crowned Clown in episode 70, "God's Clown", while fighting against a level 3 Akuma.