"The Beast!"
March 1972
Hank McCoy discovers a formula that transforms him into a more 'beastly' form
- first issue featuring the Beast
reprinted in
*
Marvel Digital Comics
no date
(no date)
*
Marvel Masterworks: X-Men HB #7
2008, in collection
(2008*)
*
X-Men: Mutations TPB
1996, in collection
(1996*)