TMNT: 10 Things You Didn't Know About Shredder

The character is either responsible for killing Splinter
The character is either responsible for killing Splinter's master or killing Splinter himself, which usually sends the TMNT on a mission of vengeance.

Shredder (Teenage Mutant Ninja Turtles)

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Didn't anyone else know about this, also who else would want to

I always hated that the 2003 show Shredder was really an Utrom in

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SPOILERS for IDW TMNT] (Please don't read if you are not caught up