Marvel Girl aka Phoenix (Jean Grey) 15 - Earth's Mightiest Blog

X-MEN #28 (1967): 1st Banshee

X-MEN #29-30 (1967)

X-MEN #31 (1967): 1st Cobalt Man

X-MEN #32-33 (1967)

X-MEN #34 (1967)

X-MEN #35 (1967)

X-Men #36-39 (1967)

STRANGE TALES #150-158 (1966-1967): Nick Fury

X-MEN #19 (1966): 1st Mimic

X-MEN #20-21 (1966): Professor X origin

X-MEN #22-23 (1966)

X-MEN #24 (1966): 1st Locust

X-MEN #25-26 (1966)

X-MEN #27 (1966): New Uniforms; Mimic joins

FANTASTIC FOUR #36 (1965): 1st Medusa, Frightful Four

FANTASTIC FOUR ANNUAL #3 (1965): Reed and Sue wedding; 1st Patsy Walker

X-MEN #10 (1965): 1st Ka-Zar!

X-MEN #11 (1965): 1st Stranger

X-MEN #12-13 (1965): Origins of Professor X and Juggernaut

X-Men #14-16 (1965-1966): 1st Sentinels!