The Egg Cauldron is a sub-boss that appears in the PlayStation 3/Xbox 360 version of Sonic Unleashed. It is a flying fortress armed to the teeth with aircraft and cannons which was used by Dr. Eggman to intercept Sonic the Hedgehog, Tails and Chip during their trips on the Tornado-1. It is fought at the end of Tornado Defense Act 1 and 2 respectively.