Peter Serafinowicz is an actor and writer. He has appeared in films such as Shaun of the Dead, Couples Retreat, Star Wars: Episode I - The Phantom Menace, and many others.
He will provide the voice-over for the gender-swapped character Lumpy Space Prince in the episode "The Prince Who Wanted Everything". He will either permanently or temporarily take over Pendleton Ward's voice-over for the character, who has also done the prince's original female version.