Objective 1: Launch the Probe
With the sensors out, the Watchtower is flying blind. First things first, head to the hangar to launch a probe. You need to find some parts. Lucky for you, as a large, gold LEGO object rests inside the hangar. Destroy it to have some bricks spill out. Build these bricks into a Gold Brick device which you can then use to build a probe.
As Martian Manhunter, activate Detective Mode and search the center of the hangar. Bricks appear that form a Green Lantern pad. Use Green Lantern to build a giant slingshot that hurls the probe into space.
Objective 2: Use the Control Console
Now that the probe has been hurled into infinity, make your way back to the control room. The control console is now active. Interact with it to proceed.