– Ra'ad, an electric alien, accidentally traps himself inside the Ultimatrix.
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Season 2: The Keeper of the Flame & Forever Knights (Episodes 21–32) – Ra'ad, an electric alien, accidentally traps himself
This series introduces the Ultimatrix, allowing Ben to evolve his aliens into more powerful "Ultimate" forms. Season & Episode Guide The series consists of 52 episodes split into three seasons: Season 1 (20 Episodes): an electric alien
– Aggregor successfully absorbs the five Andromeda aliens, becoming unstoppable.
Here is an index of the episodes in Ben 10: Ultimate Alien: