One of Wonder Woman's deadliest enemies, Giganta's size and shape-shifting abilities are rivaled only by her scientific genius.
There are not a lot of villains in Wonder Woman's rogues gallery who are a match for the Amazing Amazon in a physical fight, but the woman called Giganta is one of them. In the Golden Age, Giganta was actually an artificially mutated ape, whom a scientist named Professor Zool transformed into a red-haired strongwoman of huge proportions. In the post-Crisis on Infinite Earths universe, Giganta was Dr. Doris Zeul, a scientist who was dying from a rare blood disease. She captured Wonder Woman and planned to put her own "life-essence" into Diana's body, but the process was interrupted by Wonder Girl and her consciousness instead ends up in a test animal gorilla named Giganta.
While still inside of the gorilla's body, Dr. Zeul abducted a comatose circus strongwoman named Olga with metahuman size-changing abilities and successfully transferred her consciousness into Olga's body, leaving Olga's own mind stranded inside the gorilla. Keeping the name Giganta, she embarked on a career as a super-villain, fighting with Wonder Woman several times, both alone and with a variety of different villain teams. But Giganta has a tender side as well, and briefly enjoyed a romance with the Atom, Ryan Choi. Post-Flashpoint, Doris Zeul became a child who was often bullied and afflicted with a rare blood condition. She was cured by a scientific procedure which also gave her size-changing powers, a side effect of which was a far more limited intellect.
For more on Giganta's history, visit her page on DCUniverse.com.
super strength, durability, size alteration
WONDER WOMAN #9 (1944)