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- Magnifying Glass
Scooby-Dum made his first appearance during the Scooby-Doo half of The Scooby-Doo/Dynomutt Hour on September 25, 1976, in an episode titled "The Gruesome Game of the Gator Ghoul". He appeared in one other 1976 episode of Scooby-Doo: "The Headless Horseman of Halloween", in which Shaggy referred to him as Scooby-Doo's brother. He made two appearances in 1977, when The Scooby-Doo/Dynomutt Hour was expanded into Scooby's All-Star Laff-a-Lympics: "Vampire Bats and Scaredy Cats" on September 17, 1977, and "The Chiller Diller Movie Thriller" on October 1, 1977, in which he was referred to as Scooby-Doo's cousin again thereafter. Scooby-Dum also appears in all of the Laff-a-Lympics segments of Scooby's All-Star Laff-a-Lympics as a member of the "Scooby Doobies" team, marking his final appearances in any medium.