People who enjoy comic books and science fiction have an exciting summer ahead. The trailer videos for the film “The Dark Tower” and the show “The Defenders” were both released on Wednesday. Many people have been watching and talking about the videos online. “The Dark Tower” stars Idris Elba and Matthew McConaughey. The story is based on eight books by American horror and fantasy writer Stephen King. Elba plays the hero, known as “The Gunslinger.” McConaughey plays the villain or bad guy -- known as “The Man in Black.” King released the first book in the series in 1982. The most recent one came out in 2012. The movie comes out in theaters in August.