"Beware Planet Earth!" Heed the warning from the red planet, Earthlings! Our beloved globe is about to fall victim to a Martian strike against our single most valuable resource: cows! Protect Barney's bovine beauties in this colorful and whimsical tower defense game. Build an effective defense using towers, traps and objects, and fire your raygun at the green men. Help us repel the Martian invasion!