He made a second appearance in the Season Six episode, "The Biggest Douche in the Universe". Chef takes Cartman and his mother to his parents' manor house in Scotland. Thomas and Nelle perform a shaman-esque ritual to exorcise Kenny's soul from Cartman's body. Although they are successful in exorcising Kenny's soul, they are unable to re-seal it because Chef hadn't brought a victim child to sacrifice. Instead, Kenny finds his way into a pot roast Nelle was preparing.
His most recent appearance to date is in "Red Sleigh Down", where he are seen along with Chef in a crowd during the town's Christmas celebration. He is not seen at Chef's funeral in "The Return of Chef".
He appears to be very old, with wrinkles and grey hair. Thomas is balding and wears a blue suit and black tie with an orange shirt. He occasionally dons a pair of reading glasses.
Thomas's main subject of conversation is the supposed encounters with the Loch Ness Monster. He repeatedly claims 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.
He appears to have a good relationship with their son, Chef, whom Thomas refers to as "Junior". Because he lives in America, he appears to miss him a lot, since as he appears at their doorstep in Scotland he appears overjoyed to see him again.
- "The Succubus" - Come down to South Park for Chef's wedding.
- "The Biggest Douche in the Universe" - Chef brings Cartman and his mom to see his parents to help them exorcise Kenny McCormick's spirit from Cartman's body.
- "Red Sleigh Down" - Seen in the crowd with Chef during the Christmas celebrations.