How do y ou destroy the like helmet over lex luther on the last level and..

Well you will have a selection of characters on the level each character as you know will have it's on abilty for instance superman has heat vision so when you see a red wall go up to it and it press A(remember this is for the 3ds version so if you are talking about other versions like the Xbox this will kinda not be useful)then you have to trace the line around the red wall which will cause it to blow up therefore there will be a hole and you can jump into it.Now the level you are talking about is the final level with lex luthor is it not? I think so anyway there will be the things I was talking about before like well you have to use the superheroes abilitys to cause certain things to happen but you have to do them quickly because as you know lex luthor is still there and he will fire missiles ect so make sure you do them quickly once you have done all the stuff you need to do it shall tell you what to do (like use the grappling hook for an example)and once you have done all the things to damage him that shall be it he is defeated but the way I explained sounded easy did it not well if so it's alot(and I mean ALOT)harder than you think so I hope this helped!

First use Superman's or Cyborg's heat vision to break the gold shield, then when it turns silver Use green lantern to break it. Repeat this until the robot falls. Then when Lex luthour fall outs out of the cockpit use a grappling hook to pull him out of it.