Spongebob/The Simpsons

Version 1

 * Squidward as Homer
 * Mrs. Puff as Marge
 * Spongebob as Bart (their both yellow)
 * Sandy as Lisa
 * Mindy as Maggie
 * Patrick as Milhouse
 * Spongebob's Grandfather as Grandpa Abe
 * Mermaid Man as Lenny
 * Barnacle Boy as Carl
 * Mr Krabs as Barney
 * Spongebob's Dad as Ned Flanders
 * King Neptune as Principal Skinner
 * Plankton as Mr Burns

Version 2

 * Spongebob as Homer
 * Sandy as Marge
 * Patrick as Bart
 * Pearl as Lisa
 * Mindy as Maggie
 * Squidward as Moe
 * Spongebob's Grandfather as Grandpa Abe
 * Mermaid Man as Lenny
 * Barnacle Boy as Carl
 * Spongebob's Dad as Ned Flanders
 * Mr. Krabs as Principal Skinner
 * Plankton as Mr. Burns
 * Larry as Smithers

Version 3

 * Squidward as Homer (both are vain and grumpy)
 * Pearl as Marge
 * Spongebob as Bart (both are little and funny)
 * Sandy as Lisa
 * Snellie as Maggie
 * Gary as Snowball
 * Rex as Santa's Little Helper
 * Mr. Krabs as Krusty the Clown
 * Mermaid Man as Barney
 * Barnacle Boy as Carl
 * Patrick as Milhouse (both are Spongebob's and Bart's best friends)
 * Mrs. Puff as Mrs. Krabappel
 * Larry as Principal Skinner
 * Plankton as Mr. Burns