The Shadow King returns, in the guise of the African God Ananasi, targeting Psylocke for her telepathic powers.
Psylocke wins the fight, imprisoning Shadow King once again.
The battle ripples out to a few other issues, like Cable #57, but you really don’t need to read these issues to follow the stories in those other issues.
The big result: Every (at least I think every) psychic loses their telepathic powers. For a while.