Glen (A.K.A Glendalf, Ultra Glen & Long Glen Sliver) is Ruff & Scruff's nephew. He is obsessed with magical stuff as well as fantasy. He has appeared 8 times in Fetch! with Ruff Ruffman and 3 times each in both of the spin-offs Ruff Ruffman: Humble Media Genius and The Ruff Ruffman Show.
His first appearance is in Dog of the Rings where he sends the Fetchers to go to Wing's Castle as LARPers (Live Action Role Playing). He second appearance is in FETCH! With Scruff Ruffman Finale: Ruff and Scruff: The Untold Story in the beginning where he changed all the passwords for the Fetch 3000. He only did this because Scruff promised him "The Scepter of Wogganot" which was just a toilet brush. He next appearance is in Season Four is Cancelled where he tells his uncle how to luge. He next appearance is in Is It A Bird? Is It A Plane? It's...Ruffmanman! where he has a new identity and named him as "Ultra Glen". In How to Really Train Your Dog, he appears in the end saying he need the Helmet of Victory so he won't be a loser. His last appearance is in Long Glen Silver and the Pursuit of the Golden Fetchie! where he was playing a game on the Go Get It! website until it says that he needed a password to continue. He was disappointed that he hit himself on the keyboard and somehow got the password right which showed a map of where the Golden Fetchie is. He also wanted the Fetchers to dress as pirates.
He is a dog with glasses with a brown shirt, necklace & braces. Most of the time, due to his braces you cannot under stand what he is trying to say (Like when he is trying to say luger, he says looger.)