Question: what episode do princess bubblegum and marceline meet?
Answer: “Hello, Bonnibel” This is the earliest episode on the list and it's the first time we see Marceline and Bubblegum share the screen. It's couples night in the Land of Ooo and Finn is trying to ask Princess Bubblegum out on a date. Naturally, he and Jake turn to their vampire friend Marceline for advice.