Contender

Cade Carter has been chosen. In a world where enemies come in many forms, Cade and his friends are unwilling contenders in a deadly tournament controlled by a brutal alien overlord. They may have won the first battle, but there is not time to rest or mourn the friends they lost. In the next round Cade must duel a ferocious seven-foot-tall alien monster. Alone. Losing will lead to Earth's destruction. Desperate, Cade and his friends set off on a quest into their strange new world to search for something to give him a fighting edge. But what they find in the wilds could prove to be even more dangerous than the impending battle...