Abilities: As a sentient tree, Groot can extend and manipulate his body in apparently limitless ways. He can use his limbs like swords and never has to worry about them breaking off because they always grow back. In "Guardians of the Galaxy," we saw him form an impenetrable barrier with his branches, get blown up for the sake of his friends, and regrow.

Power scale: 2. Groot is incredibly strong and adaptable when he's fully grown. But as a teenager, he's not as experienced in battle (and super prone to moodiness). But to be fair, he's basically immortal, and it's super impressive when he skewers a group of enemies with one arm.