"Tolkien built the largest and most consistent fictional universe," YouTube sensation CGP Grey says. It's a bold and refutable claim (Terry Pratchett, anyone?). Still, J.R.R. Tolkien's Lord of the Rings trilogy is vast and detailed -- certainly not a story easily crammed into a five-minute video, which is exactly what CGP Grey has done.
The video centers its descriptions of the stories on that pesky piece of jewelry that the characters' lives are centered on, too -- the One Ring, created by the dark lord Sauron. An explanation about how the ring was forged, and what powers it actually possesses, reveals layers of Tolkien's stories even fans might've missed the first time around.