Action Comics swap bodies with a gorilla and his strip was renamed Congorilla. The introduction of Supergirl by Otto Binder and Al Plastino occurred in issue #252 (May 1959). Following this debut appearance, Supergirl adopted the secret identity of an orphan "Linda Lee" and made Midvale Orphanage her base of operations. In "Action Comics" #261 (February 1960), her pet cat Streaky was introduced by Jerry Siegel and Jim Mooney. Supergirl joined the Legion of Super-Heroes in issue #276 and acted for three years as Superman's "secret weapon," until her existence was revealed in "Action Comics" #285 (January 1962). In the view of
First appearance a much lower 5.5 ("fine minus") sold for $956,000 in 2016. Shortly after the record-breaking million-dollar sale of "Action Comics" #1 in 2010, a copy of "Detective Comics" #27 featuring the first appearance of Batman was sold for $1,075,000 in a Heritage auction. Several factors determine the value of a first appearance. Note: All values are according to ComicsPriceGuide.com and are for editions certified by the Certified Collectibles Group (see below): While seemingly a simple concept, determining the first appearance may be complex. The following are instances in which a character's first appearance may be difficult to determine: Note: All