The alien action figures in this series were awesome, even if the 5 zillion color variants were never seen in the movie. Really great sculpts and solid toy construction.
Also had to love the bonus "Mission Disk" included with each figure. While gimmicky for the time, it is beyond nostalgic cool to revist these 3.5" floppy disks all these years later. Yes, I still have a fully functional ID4 disk, which believe it or not, I still have a computer that can read them. Just look at those system requirements!
As a sucker for collectible spaceships, the Alien Attacker Ship is another big favorite of mine. You can track down all these ID4 toys pretty cheap on the secondary market.