S1·E11 – Music Brings Us Together

Using a talking skull (a recycled version of Yorick the Skull from The Muppet Show), Farkus Faffner traps Fughetta Faffner in her solidified state and traps her as part of his haunted house plot. Mimi, Riff, and Wild Impresario end up summoning Fughetta's Great Uncle Fishknife for help.