In the 22nd century, a paraplegic Marine is dispatched to the moon Pandora on a unique mission, but becomes torn between following orders and protecting an alien civilization.

All grown up in post-apocalyptic 2018, John Connor must lead the resistance of humans against the increasingly dominating militaristic robots. But when Marcus Wright appears, his existence confuses the mission as Connor tries to determine whether Wright has come from the future or the past -- and whether he's friend or foe.