Elseworld's Finest: Supergirl and Batgirl

Elseworld's Finest: Supergirl & Batgirl is based in a world in which Bruce Wayne was never Batman, and the orphaned Barbara Gordon becomes Gotham's near-dictatorial protector, and Kara Zor-El as the Girl of Steel teams with Lex Luthor and the Justice Society.
Supergirl (Kara Zor-El): After Krypton's explosion, she is the only survivor of Argo City. She lands on Earth already knowing the exploits of the Justice Society of America and joins them. Lex Luthor becomes her mentor and friend.
Batgirl (Barbara Gordon): When Bruce Wayne's family is targeted by Joe Chill, Commissioner Jim Gordon interferes, which leaves both him and his wife dead. Barbara takes her father's gun and arrests the murderer. Barbara now wears the cape and cowl of Batgirl and rules Gotham with tyrannical furor, using both might and technology, having created the Oracle Supercomputer to aid her.
The Joker: The Joker is obsessed with Batgirl and desperately tries to win both her attention and love.
Bruce Wayne: Billionaire philanthropist, he is the equivalent of Alfred to Barbara, helping her fund her hi-tech gadgets and helping her hide her secret identity.
Lex Luthor: Primary benefactor of the Justice Society, he revolutionized life in Metropolis after developing a state-of-the-art solar battery and looks to open a new battery-making factory in Gotham. He oversaw the design and construction the JSA headquarters.
Wonder Woman and the rest of the Justice Society have been permitted to make a public announcement inside Gotham Arena, where they introduce Supergirl and Lex Luthor to the Gothamites for the first time. Lex announces his plans to construct a factory in Gotham, employing a large number of its citizens. Ambush Bug senses a disturbance and teleports to find Luthor's driver being attacked via gas by an unknown assailant. Oracle stops him before he can investigate. As Lex leaves the arena, he is kidnapped by the Joker and Professor Hamilton.
As the news of the kidnapping reaches the JSA, Batgirl sets it upon herself to save Luthor single-handedly. Supergirl is told by Wonder Woman that Batgirl will not allow any Metahumans to enter Gotham, but Supergirl becomes infuriated and rushes to Gotham anyway. Batgirl sees Supergirl as a threat to her mission. She confronts her but Supergirl avoids a lengthy battle by reasoning with Batgirl. Meanwhile, Professor Hamilton reveals that he is holding Luthor captive so that he can expose to the world how he and Lex discovered the solar battery. He claims that Lex ruined his life and reputation when he tried to reveal the truth to the world. The Joker has been using a mineral-based steroid-like serum (possibly a variant of the Venom steroid used by Bane in regular continuity) to enhance his strength so that he can win Batgirl's attention. Luthor offers the Joker employment with the additional incentive of more of the minerals on which Hamilton based his steroid serum.
Read the rest of this fantastic story to see how it ends!

Back Row (L to R):
Firestorm
Jade
Flash
Black Canary
Green Lantern (Abin Sur)
Asteria

Middle Row (L to R):
Interceptor
Tarantula
Dr. Midnite
Captain Marvel
Barda
Ambush Bug

Front Row (L to R):
Joker
Lex Luthor
Supergirl
Batgirl
Wonder Woman
Bruce Wayne

Done in MS Paint.