Animorphs (1998)

Animorphs follows the story of five teenagers who gain the ability to transform into any animal they touch. They are given this power by an alien named Elfangor, who warns them of an impending alien invasion. The group, known as the Animorphs, must use their new abilities to fight against the aliens, known as Yeerks, who are taking over the minds of humans. As the battle intensifies, the Animorphs face challenges and sacrifices while trying to save the world.