The Dark Knight / Man of Tomorrow: The World's Finest (2010)

Fionnoconnor402's DCCU (Soft Reboot) Book ١ - Page VII

Set in the aftermath of Man of Steel, master strategist Edward Nygma, who discovered his passion for puzzles in childhood and later adopted the alias "The Riddler," arrives in Metropolis. He is accompanied by his accomplice, Otis Flannegan, a deranged, homicidal individual who resides in the sewers and possesses the ability to control and communicate with rats. Together, they successfully steal a Kryptonite statue and strike a deal with billionaire Lex Luthor to eliminate Superman in exchange for the demise of Batman and a payment of $1 billion. Meanwhile, Batman, having uncovered the Riddler's intentions, successfully tracks him to his current hideout. This leads to a confrontation between the caped crusader and Superman, where, despite their differences, they must collaborate to thwart both Luthor and the Riddler. The urgency escalates when it is revealed that Flannegan, while executing Riddler's scheme, has kidnapped Lois Lane, Superman's love interest.