Squid Plus One is an episode from Season 9 that aired on October 2, 2015.
- Squidward Tentacles
- SpongeBob SquarePants
- Mailman (name revealed as Norton)
- Old Woman
- Sadie Rechid
- Perch Perkins (cameo)
When Squidward gets an invitation note to go the Galleria Diphera, it says he must bring a friend to be let in. However, he has no friends to go with. So, SpongeBob helps him make a friend.