Injustice 2 features a darker narrative where Superman has established a regime called The Regime after the death of Lois Lane at the hands of the Joker, leading to Batman's rebellion. Superman is imprisoned for his actions, and characters like Green Arrow and Gorilla Grodd experience significant changes. Green Lantern transforms into a Red Lantern due to regret over his past choices. While the game showcases various characters effectively, Wonder Woman is given a lesser role. Swamp Thing emerges as a strong contender in battles due to his unique abilities and connection to nature.