The Kree-Skrull War is a significant conflict in the Marvel Comics universe, primarily involving two powerful alien races: the Kree and the Skrulls. This war began when the Skrulls attempted to invade Earth, leading to a series of battles that drew in various superheroes, including the Avengers and Captain Marvel. The conflict is marked by themes of loyalty, deception, and the struggle for power. The war escalated as both sides sought to gain control over Earth and its resources. The Kree aimed to protect their interests, while the Skrulls sought to expand their empire. Ultimately, the conflict highlighted the complexities of intergalactic politics and the impact of war on innocent lives.