Buzz Lightyear of Star Command

The Crawling Flesh (1x24)

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Zurg's Brain Pods invent a new gas that has the ability to melt and morph anyone that comes into contact with it into a crawling blob. Buzz and Mira are the first to experience it's effects and it's not long before everyone in Star Command is infected. The only cure is a unique antidote that Zurg keeps hold of.