It can't be... can it?
On this Monday's episode of Castle Season 5, hilariously titled "The Fast and the Furriest," Rick and Kate come across enormous footprints at the scene of a murder, leading at least one of them to wonder:
Is Bigfoot behind the crime?!?
Watch Espo set the scene in this clip:
Elsewhere, Once Upon a Time favorite Raphael Sbarge will guest star as a man who piques Castle's interest even more in this elusive creature. Watch their exchange below: