In the 1990s, Godzilla could have faced Bagan, a kaiju who arguably would have been one of the King of the Monsters' most powerful villains of all-time. As a monster with a cinematic history that stretches across six decades, Godzilla boasts a massive rogues' gallery. Over the years, he's fought over a dozen notable adversaries, many of which now being monster movie icons in their own right.

Curiously, one Toho monster that's often discussed by Godzilla fans never actually appeared in a Godzilla movie. The kaiju was created by Toho for the purpose of being a Godzilla villain, but he wasn't used. In fact, the creature could have been in not just one, but multiple Toho movies. He was later made a part of the Godzilla franchise via two video game appearances, but plans for his big-screen debut never did reach fruition, despite several attempts. Here's who Bagan was, what...