Ben's Complete List of Aliens in Ben 10: Ultimate Power

A *** means Ben has yet to transform into this alien. ^^^ means ben has not transformed into this alien since the orginal series.
 * Heatblast
 * Ultimate Heatblast ***
 * Four Arms
 * Diamondhead
 * XLR8
 * Ghostfreak
 * Cannonbolt
 * Ultimate Cannonbolt
 * Wildmutt
 * Ultimate Wildmutt
 * Wildvine ^^^
 * Ditto ^^^
 * Ultimate Ditto ***
 * Eye Guy ^^^
 * Grey Matter ^^^
 * Ultimate Grey Matter ***
 * Rip Jaws ^^^
 * Upgrade
 * Ultimate Upgrade ***