Hold on tight as historian Christopher Irving explores the origins of the first on-screen superheroes and the comic creators and film-makers who brought them to life. CLIFFHANGER touches on the early days of the film serial, to its explosion as a juvenile medium of the 1930s and '40s. See how the creation of characters like Superman, Captain America, Spy Smasher, and Captain Marvel dovetailed with the early film adaptations. Along the way, you'll...