Where's Pilchard? is the sixth episode of the twentieth season. It was written by Darren Jones.
Bob, Wendy and the team set out to build a tire shed for Curtis. When Muck shoos Pilchard out of his way, she suddenly vanishes. Leo and the machines run around looking for Pilchard, desperate to find her before Bob finds out that she's disappeared. When Muck admits that he had some part in her disappearance, they all discover that the cat had been sound asleep in his dumper the whole time.