Green Lantern can’t be reasoned with—you’ll have to use force! But first, you need to escape the forcefield he’s trapped you in. Begin by moving Batman to the left and use his Sensor Suit to detect a nearby magnetic lever. Tag to Robin or Cyborg and use the Magnet Suit to pull the lever.
Pulling the lever causes toxic goo to drop near you, attracting a janitor. Tag to Martian Manhunter and press the Interact button to take control of the Janitor with mind control. Move the janitor to the right, go upstairs, and hack the computer.
To hack the computer, you must align three rings on three different locking mechanisms. Start with the outer ring and spin it until it lights up, then work your way toward the interior ring. Repeat this until all three locks have been aligned. (Be sure to grab Minikit 4 before continuing.) Click the central button and click the check box to close the hangar door and cut off Green Lantern’s power ray.