They made a second appearance in the episode "The Biggest Douche in the Universe". Chef takes Cartman and his mother to his parents' manor house in Scotland. They perform a shaman-esque ritual to exorcise Kenny's soul from Cartman's body. Their most recent appearance to date is in "Red Sleigh Down", where they are seen along with Chef in a crowd during the town's Christmas celebration. Interestingly, they are not seen at Chef's funeral in "The Return of Chef."
The McElroys' main subject of conversation is their supposed encounters with the Loch Ness Monster. They repeatedly claim that they have seen him on multiple occasions, and are constantly harassed by him, as he tries to swindle them out of "tree-fiddy" ($3.50). According to Thomas, the monster has pretended to be a Girl Scout, an alien, and Chef's imaginary friend from childhood.
They both appear to be very old, with wrinkles and white hair. Thomas is balding and wears a blue suit and black tie with an orange shirt. He occasionally dons a pair of reading glasses.
Nellie has a full head of curly white hair and wears a yellow dress and a pearl necklace. Her eyes seem to be perpetually closed. She also appears to carry a small blue handbag around. In "The Biggest Douche in the Universe", she appears in full voodoo regalia, with a long white robe, an intricate mask and headdress, fake wings and one scepter in each hand.
- "The Succubus" - Come down to South Park for Chef's wedding.
- "The Biggest Douche in the Universe" -
- "Red Sleigh Down" - Seen in the crowd with Chef during the Christmas celebrations.