At the Natural History Museum, Wonder Woman and Batman watch out for Intergang. They spot a woman breaking in who reveals herself as the sorceress Circe. Using her magic, Circe renders them helpless and transforms Wonder Woman into . . . a pig. Batman goes to consult with League member Zatanna, who is in the middle of a magic show. While they look for a cure, Circe is performing as "Lulu." While consulting with a mystic shop owner, Wonder Woman the pig flees and Leaguer Bwana Beast catches up to them. Bwana Beast uses his tracking abilities to try and find her along with other Leaguers Red Tornado, Crimson Avenger, and Elongated Man, but loses her in a pig sty.
Zatanna and Batman go into the Underworld where they meet with Medusa, who was Circe's cellmate and tells them that Circe wanted to perform at the Amphitheater in Greece. Wonder Woman escapes from the factory where she's due to be processed into bacon, and defeats the butcher who's after her, but other workers capture her. Batman and Zatanna go up against Circe, who transforms her male followers into animals to attack them. They imprison them but Batman simply asks her to lift the spell. She does so . . . after asking him to sing a song with the intent of him giving up his dignity. Circe keeps her word and restores Wonder Woman . . . just before she gets rendered on a conveyer belt.
Zatanna (first appearance Hawkman #4 - Oct-Nov 1964) is the daughter of the Golden Age hero Zatara (who himself premiered in Action Comics #1 along with a certain Man of Steel...). Like her father, Zatanna can invoke almost any magical effect by concentrating and saying backward what she wishes to accomplish. She originally went to various Justice League members seeking their aid in finding her missing father - eventually they all joined together and she succeeded in her quest. A gifted stage performer, Zatanna originally wore her stage costume when superheroing, but later went through a variety of costume designs. Her powers have waxed and waned over the years - lost on occasion or simply badly written. She has been an on-again/off-again member of the Justice League and is also a member of the Sentinels of Magic. In the WB animated universe she appeared in the Batman Animated episode "Zatanna," where she was shown to be a talented magician but had no backward-speaking magical abilities. Here she does real magic (both backward-speaking and mere gestures), although it's not indicated how she obtained such powers.
The ancient Greek sorceress (not a goddess), Circe is also a comic book villainess (first appearance Wonder Woman vol. 1 #302 - April 1983, although she made several brief Golden Age appearances). She has battled Wonder Woman on numerous occasions, both pre- and post-Crisis. She was recruited by Lex Luthor to battle the Justice League as part of his Injustice Gang, and has since attempted to become President Luthor's First Lady, transformed every male hero on Earth into animals under her control, and tried to destroy Wonder Woman once and for all. This is her first appearance in the WB animated universe.
B'wana Beast the Jungle Master (first appearance Showcase #66 - January/February 1967) is ranger Mike Maxwell, who gains his powers from a mystic potion (or his helmet - it tended to go back and forth over the years). Created by Bob Haney and Mike Sekowsky, B'wana could charitably be described as a "Jungle Aquaman" (damning with faint praise, as it were) and after a brief two-issue run he faded into obscurity until Grant Morrison brought him back in Animal Man #1-4 (1988) and killed off his supporting cast. Maxwell has since been replaced by Dominic Mnawe (in Animal Man #13), an actual South African, in a stab at a more "realistic" character. Insofar as a barechested man with a goofy helmet who merges animals could be considered "realistic." "B'wana" is Swahili for "master" or "guardian" - Mnawe took on the name "Freedom Beast." One power he possesses in the comic books that isn't mentioned here is (perhaps thankfully) his ability to merge two or more animals into a single hybrid with the abilities of all of its components (think the Impossible Creatures computer game). This is his first appearance in the WB animated universe.
The second Red Tornado first appeared in Justice League #64 (August 1968). Originally an android superhero who worked with the JSA, it was later revealed (in Justice League of America #193 - August 1981) that he was born on the planet Rann and was originally the criminal Tornado Tyrant (first appearance Mystery in Space #61 - August 1960), who later reappeared as the good-hearted wind-being called the Tornado Champion (first appearance Justice League of America #17 - February 1963). It was revealed that this creature eventually merged with an android called the Red Tornado, a sentient weapon created by T.O. Morrow to infiltrate the JSA. Having no memory of his previous life, the Red Tornado nonetheless felt the compulsion to do good, rebelled against Morrow, and eventually became a valued member of both the JSA and the JLA. It was later revealed he was an air elemental and joined the supernatural Leymen (a.k.a. Primal Force) for a brief time. Still later, he was found by the Young Justice team in the former JLA HQ of Happy Harbor. He became a reserve member of the JLA and mentored the youthful heroes of Young Justice until the team disbanded. This is his first appearance in the WB animated universe and his origin, whatever it may be, would almost have to be different (and substantially simpler) then the one above. Presumably he is an android in the WB animated universe, although a viewer at this point might just think he's a guy with an Iron Man-like mask with deep eyeslots.