As someone who has beaten the game over 4 times now, I gotta say, I never knew he transformed.
On our honour mode 4-man game (that finally got me my honour achievement) we found out that he turns into a giant monster mash... It... It uh...
Was the coolest damn thing ever!
For some reason, it brought me back to an MtG card that I found totally cool - and still do:
"Unfortunately, all my test animals have died or escaped, so I shall be the final subject. I feel no fear. This is a momentous night."
-- Laboratory notes, final entry.
