During World War II, airmen risk their lives with the 100th Bomb Group, a brotherhood forged by courage, loss, and triumph.

In the near future, Doc Terror and his cyborg companion Hacker unleash their forces to conquer Earth! Only one force can stop this evil: a handful of brave men. In specially created Exo-Frames, they can be transported anywhere to fuse with incredible assault weapon systems beamed down from the space station Skyvault, becoming man and machine, Power Xtreme! Max Ray, brilliant Sea Operations commander! Jake Rockwell, rugged Land Operations specialist! Ace McCloud, daring Air Operations expert! Whatever the challenge, they are ready - The Centurions!

When the Pillars suddenly appear on Earth, threatening all life, it's only the act of the god Odin that offers humanity salvation. Providing a means of fighting back, he gives Earth the Valkyries, young female pilots with supernatural powers and spirit fighter planes. These skilled troublemakers, all young, risk their lives in a long-running war—but the final battle is fast approaching!