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Desperate for an escape, Ben jumped at the chance when his old friend Tetrax Shard arrived with a proposal: a "total alien immersion training program" on the far side of the galaxy. But the "immersion" turned out to be too literal. A malfunction triggered by Gwen's magic during an earlier battle caused the Omnitrix to lock Ben in his alien forms, preventing him from turning human again. ben 10 destroy all aliens transcript link