The Outcast was a monster called Xorak, that works for Cyttorak as Crimson Crystal protector, but after a fight against the Ancient One, he becomes an eternal Outcast, protecting the Gem from its inside plan. Battled the X-Men in issue #33 and was defeated by Cyclops and Marvel Girl inside Crimson Cosmos with the help of Dr. Strange.
Creation
Xorak aka the Outcast was created by Roy Thomas and Werner Roth in 1967 and first appeared in X-Men # 33.