The tentacle monster was the disguise of an unnamed businessman.
Physical appearance[]
It's a green octopus with multiple tentacles, purple spots and black sclera eyes.
Personality[]
It appeared to have been sneaky as it was waited on the Mystery Machines roof to attack the gang when left to investigate.
History[]
Scooby-Doo (DC Comics)[]
The tentacle monster sneakily landed on the Mystery Machines roof while they were heading to Fred Jones's grandmother's house for a fancy party, both Shaggy and Scooby left the van first and spotted the creature, who then goes for the attack.
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Businessman unmasked.
He was later unmasked to be a businessman trying to buy property around an airfield.