Xannon says:

This is such a cute addition to this set! The astronaut with the robot helps to mine the energy crystals needed back on earth (guess we finally DID run out of gas!). The robot hides the crystals in his chest from the aliens and is super cute. He’s very well loved in this house. You need two sets of this one if you’re going to make a dent on Mars’ surface. If you’re scared away by the price on this guy, you can get him at the giant toystore with an r in the name (not online) for four dollars. Great, great toy, glad they came up with this series. Boys love space travel and this set really provides a different element. Highly, highly recommend!