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Here's a brief bio
My bad he first appeared early 70s
Still though he's been around a while. Seriously, this guy is to Batman as Luthor is to Superman, hot stuff that they're bringing him into the movie (just hope they don't kill him off
)
Scarecrow on the surface is a pretty lame villain however given the right setting and treatment he can be a really good opponent...he won't be in the film for much though since the majority will focus on Ra's