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Xl Terrestrial attended the H.I.V.E. Academy and later fought in the final battle. In "Calling All Titans" he stopped Tramm from helping Aqualad. At the end of "Titans Together" you see Xl Terrestrial with the Titans after the battle, which is strange because he is evil.
It maybe possible that, off screen, he may have changed sides. Still, this is only a possibility, not a fact.