There is no actual theme song to the show, but at the beginning of each episode, a low bass sawtooth note being driven through a resonant low-pass filter with slow but constant ticking of a clock playing over it is heard over the title cards listing the creator, episode name, storyboard artist(s), and creative director. The only exception to this was "It's Time", where the opening theme to the Zombie Dinner Party plays instead of the ticking.