Episode 37-Dance of the Mayflies

One thing the Than hate is dead people walking around and they will stop at nothing to exterminate the un-dead even if it means destroying their friends on the Andromeda.  At least we think that's what's going on. They never actually bothered to let us in on what they're up to. 
What do Mayflies and Zombies have in common?  Nothing really. And they're not really zombies anyway. It's a super alien race taking over human bodies and operating in a zombie like state. They're not much fun at parties and they don't like to boogie, but the living and reanimated corpses alike love to cut a rug in the "Dance of the Mayflies."