Leo

Leo is a member of the Zodiac, Marvel's villainous syndicate of criminals organized around astrological signs. Representing the Leo sign, the character operates as part of this collective that has repeatedly clashed with the Avengers.

A creature of the Marvel cosmos, Leo made their Silver Age entrance in The Avengers #72 back in 1970, conjured by the legendary Roy Thomas and Sal Buscema during one of Marvel's most imaginative eras. Running a remarkable span of four decades, this character has kept some genuinely striking company — sharing pages with the likes of Aquarius, Taurus, Sagittarius, Virgo, and Pisces, a constellation of figures that hints at the grand, celestial scale of the stories Leo inhabits. With appearances across Avengers and Avengers Assemble and a spot in Marvel's own official handbooks, Leo has earned a place in the publisher's canon worth more than their modest page count suggests — two of those appearances carry key-issue weight that collectors will recognize immediately. A compact but cosmically flavored corner of the Marvel Universe, Leo rewards the curious fan who loves digging into the Silver Age's more esoteric corners.