Sunspot needs to climb one more mountain to join an elite space climbing club - and the mountain happens to be Mt. Sharp, on Mars! Jet convinces the kids to fly to Mars with Sunspot and join the mountain climbing expedition. With all the Earthie kids away for the day, Jet and Sunspot are left to their own devices. They notice neighbor Mitchell digging for buried treasure in his yard, and decide to make and bury their own treasure, then make a map that Mitchell can find and follow to their homemade treasure!