Even though we really don’t know how the aliens in "Ben 10" wound up in the Omnitrix in the first place, we do know that they traveled their home planets in style! Greymatter's awesome alien ship is unique because of the special DNA structure or terrain in which they lived. Greymatter’s transforms into a flying saucer … with wheels, while Fourarm’s comes with two steering wheels to accommodate his numerous appendages! All the vehicles also have a fun “water-pumping” action feature. Push the pump on the top of each vehicle to see the water flow via specially designed power tubes.