Barney/The Wiggles

Version 1

 * Barney as Sam
 * BJ as Greg
 * Robert as Murray
 * Carlos as Anthony
 * Jeff as Jeff (same name)
 * Baby Bop as Dorothy the Dinosaur
 * Riff as Wags the Dog
 * Michael as Henry the Octopus
 * Scooter McNutty as Captain Feathersword
 * Tina as Magdelina the Mermaid
 * Kathy as Flora Door

Version 2

 * Robert as Greg
 * Stephen as Murray
 * Jeff as Jeff (they both have the same name)
 * Chip as Anthony
 * Tina as Dorothy the Dinosaur
 * Trekkie Monster (from Avenue Q) as Wags the Dog
 * Groundskeeper Willie (from the Simpsons) as Henry the Octopus
 * Kyle Broflovski (from South Park) as Captain Feathersword