*puts on special ed, know it all helmet*

Technically his blue fur is his second form, as he was initially grey. Also, him turning furry wasn't a mutation, it was just the result of an accident, unless they retconned that.

*takes off helmet, remains virgin*

:(

First and second.

The more recent mutation of Beast. The one that young Hank helped him turn into after he got sick in All-New X-Men.

So the third mutation, I guess.

I always like the way he looked during the late 70's and 80's. First mutation for me.

Yeah, I know. I actually own the comic where he first turned into "The Beast" but I doubt the majority of people even remember that. Especially since the blue one was implied to be his first in the comics since then. Him turning furry has also been called a mutation caused by him taking the formula. It was still a mutation, just not a natural one.

The first one. I really didn't like the second one at first but it grew on me.

Third mutation.

Third, third, and third

Mutation 1.5 (was Greyish originally after 1st mutation).