Ben Tennyson accidentally enters Rex Salazar’s dimension through a rift, leading to a clash—and eventual alliance—against Alpha , a rogue nanite created by Rex's brother, Caesar.
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The crossover begins when a mysterious rift opens in the sky over New York City in Generator Rex's dimension. universe-threatening enemy named Alpha.
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Ben uses his Ultimatrix to turn into several aliens, but the crossover featured the debut of a unique transformation:
: The realization that they face a mutual, universe-threatening enemy named Alpha.