Uncanny X-Men #6 is a really interesting early issue because it brings Namor into the X-Men's orbit.

Uncanny X-Men #6 is a really interesting early issue because it brings Namor into the X-Men's orbit. Xavier wanting Namor as an ally and the story exploring whether Namor might actually be a mutant made this one especially fun. What I liked most, though, was the dynamic between Xavier and Namor. Seeing those two personalities play off each other gave the issue a very different feel from the ones before it. That's what really made this one stand out to me.