Glenn, Teddy, and Benji Jamison, brothers, are sent to an alternate dimension and find themselves in the Vast City of Mebsuta when Teddy discovers what he believes is an ordinary guitar amplifier among his father's things. Fearing the ancient disease that almost wiped out the people of Mebsuta, they choose to undergo a medical procedure that gives the brothers enhanced strength, speed and mental ability. They discover forgotten islands, and ancient technology while the city splits into two opposing governments, the Legacy Party in the west, and the Timeless Party in the East. Glenn, Teddy and Benji use their abilities and enlist the aid of their home world to stop the Timeless Party's monster soldiers and the evil scientist Breckinbauer, who developed a serum from the blood of naturals, that allows him to live for ever.