Genesis

S4, E1: Quinn and Maggie anxiously leave a world of motorcycle-riding cowboys and Indians, and after three months of searching, finally land in Quinn's home dimension, Earth Prime. Maggie quickly realizes that, somehow, she has adapted to the air of Quinn's Earth -- but the place is not as he left it. Earth is ravaged, war-torn... the Kromaggs, a dimension traveling warrior race from a parallel world, have enslaved the planet, as they do with every world they find.