On the right side of the area you will find the Thor (Classic) Character Token. To get it, switch into Iron Man (Mark 42) and use your rockets to smash the silver rock.
Deadpool Red Brick
To find "Mini Characters" Deadpool Brick, you must melt down the wall placed in the centre of the location (near to the gate where Heimdall is imprisoned). You can use any character with fire powers, e.g. Human Torch to do that.
Stan Lee in Peril
To rescue Stan Lee, choose Magneto or Polaris and - with their special powers - open the metal jaws placed on the right side of the gate.