This is a completely random topic... hence why it is here on this topic!
Anyone familiar with Stargate? Particularly SG-1? It was my favorite show, and I think one reason I got into it was because of it's similarities to Animorphs. There are the Goaul'd, a parasitic snake that enter into their hosts spinal column and take control of them. Sound a little familiar? Except, unlike the Yeerks, they don't try to enslave the galaxy, at least not as hosts or "controllers". Instead the Goaul'd pose as mythical gods and have humans around the galaxy worship them. There aren't as many Goaul'd, partly because it's hard for them to reproduce. They can be in the same human body for hundreds of years or even millenniums, thanks to their healing and anti-aging capabilities, and they also have technology "sarcophagi" that will heal them from any injury and even restore life.
Also the Air Force are the ones who go through the Stargates to stop the Goaul'd mainly from coming to Earth, which has many potential hosts for them and slave worshipers. It is a top secret branch of the military, so no one knows that the war is going on, just like the Animorphs. The only difference is that the Air Force cannot transform into creatures and animals. Well, there are obviously many differences, but...
So yeah! Yeerks and the Goaul'd would get along real well. Or maybe they would just be enemies competing for the enslavement of humans... Who would win in a war between the two? (For those of you who have seen SG-1.)
PS Pop quiz: Where did KA get the name "Yeerk" from?