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[[File:Magic_Elixer.png|thumb|left]]The '''Magic Elixir''' is
a figment of [[Calvin]]'s Imagination, a liquid that [[Calvin|he]] drinks to change himself in some way.
In a weekday strip, the magic elixir he drank turned him invisible. In a Sunday comic strip, [[Calvin]] drank a magic elixir that grew him into a giant, and he proceeded to attack [[Calvin's Hometown|the city]]<ref>[http://cdn.svcs.c2.uclick.com/c2/95b286ca250a102d94d7001438c0f03b] Gocomics.com: July 20 1986</ref>.