Luke Cage adds a new character for season two. Get a look at The Flash's latest take on a classic comics villain. Arrow teases a very special return. Plus, new snippets of Avengers: Infinity War footage, and new looks at the returns of The Originals and The 100. Spoilers, assemble!
Video: Though Mary Wollstonecraft Shelley's Frankenstein wasn't published until 1818, the teenage author started penning the story 200 years ago -- inspired by a memorable nightmare and the gloomy, volcano-spurred climate event known as "the Year Without a Summer".