We all know that Little Bad Boy is going be another Fionna & Cake episode. And this time, it's all about Marshell Lee(Voice by Donald Glover) with the return of Neil Patrick Harris(The Voice of Prince Gumball). But there is one thing I need know, is Flame Prince gonna be in that episode too? At least a cameo apperances? And who's gonna do his voice if he does speak? I'm just carious.