MB-01 Command Base. Your builder will find a challenge in building this sprawling command base for the mining specialists as they load crystal energy into their space shuttle to send it back home. Fend off the “aliens” using the air powered rockets, or capture “aliens” and send or receive them through the reversible “Alien Transport System” with a few quick pumps of air. Includes 4 mining specialist minifigures, 4 glow in the dark aliens and 3 sleds for transport. 763 pieces.