Legion (TV Show) Font

Legion is a TV show based on the Marvel Comics character of the same name, following the story of a mutant with extraordinary powers and a troubled past who must confront his inner demons and fight against powerful forces trying to control him.

The TV show logo probably uses ITC Avant Garde Gothic Medium font with a modified "O". It's a geometric typeface by Herb Lubalin and Tom Carnase. A free alternative is Auvant Gothic Medium from OPTIFont, downloadable for free from the Fonts Used Section.