The Limax are an alien species that got stranded on earth and want to get to there ship to escape.
They are slimy green like aliens, you can see there iner body which looks like intestence.
They can take over the body of anyone and can shift into different things.
They make an appearance in Permanent Retirement where they take over Aunt Vera and her town. As they work on there plan they finally get under ground and power there ship, however Ben shows up and ruins the plan.
When they form as one big Limax, Heatblast burns them up and defeats them. In the end of the episode a Limax is shown still alive.