Stan Lee: Prized Prisoners
Look for the glass prison tubes at the base of Kang's Citadel.
Use sonics to bust out all the prisoners, but they're still trapped by the laser walls.
Note that the pedestals where the prisoners were have symbols on them. These form the combination to the buttons- Star, Circle, Green.
Entering this code opens up a little storage area.
Smash everything inside and free the prisoner. You can now see a hackable lazer maze in the corner.
Run the maze to deactivate the walls, free Stan, and get a brick.