The Kelp Monster was the disguise of Mr. McFinn.

Physical appearance

The Kelp Monster is a big glowing green seaweed creature with eye holes, a mouth hole, legs, and arms.


The Kelp Monster was very cruel when helping the Ghost of Captain Pescado and the Octopus Monster trapping Velma Dinkley, Fred Jones, and Daphne Blake.


The Scooby-Doo Show

Season one


McFinn unmasked.

The Kelp Monster attacked the gang alongside the Ghost of Captain Pescado and the Octopus Monster. He was sleeping in the control center, until the Octopus Monster chased Shaggy Rogers and Scooby-Doo and the Kelp Monster woke up and chased Velma Dinkley. The Kelp Monster and his pals found Scooby, Shaggy, and Velma in a sunken ship. The three monsters were captured and unmasked. Pescado was First Mate Carp, Kelp Monster was McFinn, and the Octopus Monster was Mr. McGil. The three criminals were then taken to jail.



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