Sir Cecil

Sir Cecil the Sea Sleep King is the vision of a magical octopus who originates in the book The Land of Perpetual Excitement. He appears in the episode "InSPONGEiac."

Description
He is a light olive green magical octopus with a light gray beard, a thin mustache, and a lime green caudal fin.

Role in episode
He is mentioned in the bedtime story is telling  to help him sleep. Sir Cecil appears during the bedtime story and sprinkles SpongeBob with "sleepy dust."