Shellshock is a giant red-orange sea dragon who makes his only appearance in A Willie Scary Shalloween. Originally thought of to be a fictional character made up by Junior, Willie believes his word and goes out to find the real Shellshock to prove he can be just as big as the others. The others end up going to search for him, where they too stumble across Shellshock. Shellshock almost eats them when Willie says he wants to be his friend. This touches the dragon, confessing he's really a vegetarian. He is then invited over to the Shalloween party, where he scares Junior and tells a tale of his own.