"The Dimensional Caper" First appearance of the Aliens of "Dimension X".
*Teenager Chet Walters becomes the town laughingstock when he tells his story of being kidnapped into another dimension. When the Teen Titans investigate, they discover that Hillsdale High actually is the secret base for an alien takeover, and that the school principal is one of the extradimensional alien leaders. Entering "Dimension X", they rescue Chet Walters and his fellow students from being trapped in the alternate reality and being replaced by duplicates. Kid Flash then uses his vibrational powers to sever the link between the Hillsdale High of Earth and that of "Dimension X". *Source: Official Teen Titans Index #1 - Published by ICG