When you need the access card so that Scooby and Shaggy can get through the mist. You must first three mists then go to one of the lockers. One should open and have the red access card inside. Then, go over to the controls so that you can get the robot. Take it over to the red access card door. The door should then open. Go in and turn off all of the knobs. You are now able to go through the door that was blocked by steam.