Tigra (Greer Grant Nelson) is a fictional super-heroine appearing in American comic books published by Marvel Comics. Introduced as the non-superpowered crime fighter The Cat in Claws of the Cat #1 (Nov. 1972), she was co-created by writer-editor Roy Thomas and artist Wally Wood (Marie Severin was then brought in to help layout the art), with her early adventures written by Linda Fite. She mutated into the super powered tiger-woman Tigra in Giant-Size Creatures #1 (July 1974), by writer Tony Isabella and penciller Don Perlin.