Professor Mertin Fargleman (Voiced by Tom Kenny), also known by his supervillain named Professor Twiny Vines, is a character in Back at the Barnyard and the main antagonist of Pooh's Adventures of Cowman: The Uddered Avenger. Mertin is a twisted botanical genius, as well as being a genius in plants. He created many plant hybrids, such as deadly constrictor vines and exploding avocado bushes. Year after year, they were rejected at the county fair. He wanted to steal the Jurassic Corn Kernel to create a plant so amazing, so terrifying, and capable of bone-crushing mayhem, which was a giant corn monster so he could let go of his anger to the people and to win the blue ribbon.
- He'll make his first guest star appearances, get revenge on Winnie the Pooh, Tino Tonitini, Mickey Mouse and his friends and become enemy of Ash Ketchum, Littlefoot, Simba, Sora, SpongeBob and his friends in an upcoming remake version of Winnie the Pooh Visits The Tower of Terror.