This is not actual South Park footage, but the characters are in the form of puppets for Anime Studio.\r
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Eric Cartman is about to finally brawl with Kyle Broflovski because the latter refuses to suck the formers pubical sack after losing a bet. Stan Marsh, with a little help from Eduardo Valerosa (from Fosters Home for Imaginary Friends) and The Powerpuff Girls, trys to break up the brawl.\r
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Note: Stan, Kyle and Eric are copyright of Matt Stone, Trey Parker and Comedy Central as is South Park. Eduardo, Blossom, Bubbles and Buttercup are copyright of Craig McCracken and Cartoon Network as are Fosters Home for Imaginary Friends and The Powerpuff Girls.\r
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Second note: You can download the following puppets for Anime Studio:\r
Eduardo - \r
The Powerpuff Girls - \r
Eric, Kyle and Stan (and Kenny also included) - (download link in the description of that video, thanks to Zack (AnimeStudio101) for these puppets)\r
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UPDATE: As of April 11, 2013, this video is a Creative Commons video, so anyone can now add a scene from this video in the YouTube video editor.