The Cactus Creature was the disguise of Otto Sorts.
Physical appearance
It resembled a humanoid cactus with flowers each attached to its arm and head.
Personality
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Powers and abilities
It can shoot cactus spines and leaves a trail of spines as it goes.
History
Otto Sorts unmasked.
He had a grudge against the Trundles band and who wanted to make his own album with their background music CD. (Scooby-Doo! and the Cactus Creature)