With the release of Godzilla this weekend, Hollywood revisits one of the most popular film genres: the giant-monster-run-for-your-lives movie. Godzilla is the most famous of the kaiju, enormous beasts who've populated Japanese drive-in cinema since the 1950s, but he's not the only one by any means. No, there's a whole universe of kaiju who've fought many a clunky battle against each other over the decades. There are massive dinosaurs, mutated insects, oversized robots called mechas, and crazy things from outer space that just want to destroy everything in their path. These 15 giants are the most badass kaiju from Japanese movieswill Godzilla's 2014 foe, the mysterious M.U.T.O., measure up?

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