– Diagon breaks free, transforming Earth's population into his loyal minions.
"Fame" – Ben's secret identity is revealed to the world.
– Darkstar and Charmcaster team up in Ledgerdomain to steal magical energy.
(Note: the Ultimatrix sometimes grants temporary evolutionary “ultimate” forms distinct from canonical Omnitrix transformations in other series entries.)
The finale, The Final Battle , often airs as a single double-length episode, but is indexed as two parts in official guides.
– Will Harangue creates a giant robot programmed with Ben's fighting style.
Swaps his standard fire for blue, gel-like napalm blasts and durable wood armor.
"Ultimate Aggregor" – Aggregor successfully absorbs the powers of all five Andromeda aliens.
"The Forge of Creation" – Aggregor reaches the cradle of the Celestialsapiens; young Ben from the past accidentally joins the fight.
"Basic Training" – Ben, Gwen, and Kevin are forced to undergo official Plumber academy training.