Lego Batman 2: DC Superheroes Walkthrough Part 19 – Chemical Signature, Part 2
On this level of the Juggernaut, turn your attention first to the left. Below the ledge there you will find a civilian in trouble. How he got on there, no one knows. With him dealt with, head to the top of the ladder. Smash the generator there with a quick Batarang. It will shut down the camera but call up 2 Assembly Boxes. Head there and hit the Lexcorp insignia again to shut them both down in a hurry.
With that done you need to change to Robin. Get him up to the ladder and head to the right. There you will find a Shiny Blue block that you can target with a magnet. Lock onto it and wait for it to be pulled forward and shut down the steam vents.
Now, switch to Batman in his Sensor suit and cross where the steam jets where. Jump across and aim at the 2 clear blue pieces behind the pipes you just jumped and in front of those blocking your way forward. Smash them to reveal a X-Ray wall. First, interact with the lower left piece. Now, look to the top right of the screen. There is a second piece you need to fool with. With those 2 pieces in place, interact with the top left switch to activate the whole section and shut down the second round of Steam Jets.
Head to the right past the second set of deactivated Steam Jets. Unfortunately this draws the attention of some airborne units onto you. Quickly throw a Batarang at them to take both down. From their pieces you can assemble the Bat Suit for Batman. Have him change into it immediately then head over to the right. Position Batman near the edge of the electrified pit. Move Robin in front of him and use his Magnet on the Shiny Blue piece in the foreground. It will elevate some of the area around Batman. Quickly change to Batman and use the Glide ability of the Bat Suit (hold Jump) to clear the pit.
On the other side of the pit, smash up the generator there to stop the flow of power to the pit. It is clearly the way forward but there is still a little more to do first. Head to the right, past where you smashed the generators. Use the Sonar Gun on the piece of tech that is just past them to shatter the Clear Blue pieces. Now change to Robin and pull on the assembly with his magnet. It will whip back into the ground after a good blast of being pulled on. It will break into pieces that can be assembled into a Remote Terminal for the Bat Computer. Before you use this, be sure to head back to the pit and collect the container there as it will be sealed off after that.
Use the Bat terminal and the Bat Jet will fly in and blast a few holes in the Juggernaut. Head through the hole on the Top level of the front first. Switch to Robin and use his magnet to pull down the wall inside to the left.
Head through the new hole in the wall. Inside you will find 2 Scientists and 2 Assembly Chambers. The chambers on the left and right of the glowing globe in the center of the room. Again, hit the Lexcorp insignias to shut them down.
Now, head to the front left. There you will find a lever to throw. It will open a shutter door to your left there. It will call a robot forward that is now patiently waiting for something else to happen: Smash it. Switch to Robin and head for the shiny blue path in the left-hand side. Use it to get up to the ledge above you. Now, use the Magnet once again to open the shutter and call out another Robot. Smash it like the other one then assemble its pieces into a Grapple Point. Now, from there Grapple onto the one energy projector that is still circling the center of the room. Wait until you are on the far side of the room and jump off. Now, use the Sonar Gun to smash the clear blue container there. Throw the lever that is inside it to get the final robot to appear. Smash it to finish this part up: revealing the Kryptonite they were hunting. The Joker uses the disassembling ray to smash apart the bat mobile.