Thundercats: Sourcebook One Shot Issue is a one shot released in January 2004. The one-shot crossover comic was between the ThunderCats and Superman. It had two variant covers.
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Earth's champion meets the galaxy's toughest 'Cats in a special crossover issue While attempting to stop Mumm-Ra 's mutants from retrieving another Eye of Thundera from an alternate dimension, the ThunderCats are hurled into Metropolis! Can the Man of Steel withstand a blow from the most powerful sword in the universe?
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Variant Cover