This requires you to win a multiplayer match and has to be done online. (no split screen/system link) The multiplayer consists of an allocated number of points which can be spent on creating a team of both human and aliens soldiers. The game will play out the same as the single player and will be over when one player eliminates all members of their opponent’s team.
This will require skill and strategy when going up against randoms but can be easily boosted by having one player skip their turn until all their soldiers have been killed.
To find players to boost this with click HERE