Invasion They're coming. Dropping from the sky, legions of monstrous aliens bent on destruction. Fire up your laser cannon, check your shields, and get ready for alien gold to fill your coffers in this five-reel sci-fi slot. Get 3 or more scatter symbols to trigger the Alien Invasion bonus. There's a bounty out for aliens, so keep firing, keep moving, and keep winning - you might just score the Progressive Jackpot.