Shelley (also known as the Turtle Monster) is one of the monster pets and one of the secondary antagonists of Disney/Tim Burton's 2012 stop-motion animated film Frankenweenie.
Her vocal sound effects were provided by Dee Bradley Baker.
The Monster Turtle is actually Toshiaki's dead turtle named Shelley. When he digs it up to use Victor Frankenstein's reanimation secrets on it, the experiment goes awry and the resurrected turtle grows into an enormous Godzilla-sized monster after getting doused with Miracle Gro whilst being struck by the lightning.
The Turtle Monster then begins to rampage around the town and then the Dutch Day festival stomping and crashing cars, destroying everything in sight. Toshiaki needs Victor's help to resolve his problems, so Victor and Toshiaki and Bob went to the Dutch Day festival to stop The Turtle Monster. Toshiaki went to the ferris wheel to take a video on his monster pet but the beast approached Toshiaki and began to attack him, however Victor managed to stop the beast after throwing a live cable into the puddle Shelley was standing in, thus electrocuting the monster and reverting it back into the dead turtle it once was.
- Shelley's name appears to be a reference to Mary Shelley, author of Frankenstein.
- Shelley is definitely a parody of Gamera, another kaiju rival of Godzilla from a different franchise, as his appearance implies.
- Despite Gamera's unpopularity outside of Japan, many people still though that Shelley is a parody of Godzilla.