O'Brien explained last year why he opted not to reprise his fan-favorite character, Stiles, for the Paramount+ reunion movie. Tyler Posey, Crystal Reed, and more chat with ET about 'Teen Wolf ...

The movie – which won four Oscars and was a blockbuster hit – explores the friendship between an alien and Elliot, played by Henry Thomas, a young boy who tries to help ET go home while being chased ...