Jonas and Stefan Meet up in Season 2, Episode 16: "The House Guest"
No one’s happy to be dealing with Katherine again, but Damon, Stefan, and Elena realize that her expertise in Mystic Falls’ history might be able to help them. Caroline surprises Matt in a bid to win him back, and Alaric surprises Jenna in a very different way. Katherine makes a shocking confession to Damon, while Stefan and Bonnie try to undermine Jonas and Luka’s loyalty to Elijah. Their plan backfires and results in a dangerous altercation.