Peter the chimera cat shifter

The avengers are a group of super heroes who fight to save the world from the clutches of evil, but their real identities have become so well known that they can't go undercover anywhere because they would instantly be spotted. Enter Peter, a young 15 year old who has the ability to shift into a cat. The avengers found him injured in his cat form and they decided to take him in, not knowing of his abilities. When Peter trusted them enough he showed his human form to them and at first they were shocked but they accepted him. He decided to work for them as an undercover spy and collect information on villains and suspected criminals. But now an evil has appeared unlike anything the avengers have ever seen and Peter may be the key to defeating the evil and saving the world.