The Tayusins

The Tayusins are a band of aliens who just want to rule the galaxy. However, they were outsmarted by the Geniuses.

What they look like
Snakes without eyes that have a spiked wrecking ball for a tail.

In The Geniuses
The Tayusins managed to capture the Geniuses in Book 3. However, Matt busted them out in the MattShip. they also maaged to kill the band of Tayusins, and managed to save the galaxy. again.