When Mickey frees him, he uses a control panel to shut off the seven steam valves, freeing up the path to Great Big Tomorrow. However, if Mickey thins the brackets, the path to Gremlin Wilco is eliminated. When done, it reveals a steam valve. Freeing Wilco is recommended, because he makes an easy path to Gremlin Roger, which, in a chain of events, gives Mickey a Bronze pin (free Roger, finish "UFO Challenge" quest and open the treasure chest on the UFO).