With Athena's mirrored shield and Hermes's sword, Perseus sets out to find Medusa, whose gaze turns everything to stone. Along the way: three old sisters who share a single eye, a princess chained to a cliff, and the fulfillment of an ancient prophecy.

When young King Arthur's sword breaks in battle, Merlin leads him to an enchanted lake. There, from waters as still as a mirror, the mysterious Lady of the Lake offers him Excalibur, the most famous sword in all of legend.