Ultimate Crystal

thumb|238x238px|The Ultimate Crystal.
The Ultimate Crystal is a powerful crystal that appears in the Cops N' Robbers 2 episode. It is stolen from a museum by Bowser, until Mario and Luigi take it back. Later, the Wario Bros. steal it and use it in their experimentations. They successfully create a machine that converts the crystal into a slimy ooze. Bowser later touches the ooze during a battle, and it brainwashes him into thinking he's a criminal mastermind. The ooze may have also been utilized when brainwashing Luigi later on.