Returning home after the war, you find your family murdered and your government overthrown. You go on a series of missions to recapture your planet and bring the murderers to justice.
Missions vary widely in objectives and terrain.
One interesting aspect is that after each mission the computer will automatically scavenge parts from any mechs that you destroyed, which give you access to new mechs and the ability to customize your own. The campaign mode is great, but if you just want to blow up stuff, you can go into the Instant Action mode, where you can play missions, death matches against the computer or compete in the Master Trial, where you are pitted against three random mechs. Every part of the game, including the buildings and trees, is greatly detailed. The transition scenes are fluid and do a good job of advancing the plot. Rated for ages 13 and older due to animated violence.