Just like any super popular thing, SpongeBob Squarepants has been mashed together with just about every conceivable piece of pop culture (especially superheroes, so many superheroes). Because that's what the internet does and a yellow square works well with just about everything. 

 

1. Batman

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Source:  eatgeekplay

2. Breaking Bad

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Source: bourrouet

3. Dragon Ball Z

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Source:  ufunk

4. Hellboy

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Source: deviantart

5. Eddie

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Source: sleevage

6. The Fantastic Four 

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Source: scansdaily