Honestly, X-Men #111 is one of the best Claremont issues so far, and there’s already been a bunch of good ones.
I don’t know why it’s so good, it just is. It’s basically a done-in-one (although technically it’s part one of a Magneto story), where the Xers have been hypnotized by Mesmero into circus freaks and the biggest X-freak, blue hairy Beast, has to save them.
By fighting them.
In the end, the team shakes off Mesmero’s influence.
Complete with big Magneto cliffhanger.
This is one of the 100 best single-issue stories of the Century (notwithstanding that the final page introduces another storyline).