What to know
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The Red Brick in The Big Dukeroo unlocks the Showbiz modifier and is tied to the Joker mission.
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The collectible is found in a marked apartment building on the side of the map, not on the main path of the mission.
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You need Catwoman and her cat summon ability to reach the hidden route through a cat flap.
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The puzzle is simple once you reach the apartment: use the cat platforming route, then pick up the brick to claim the modifier.
In Lego Batman Legacy of the Dark Knight, the Big Dukeroo is an open mission, so the Red Brick can be missed if you stay focused on the main objective. The Showbiz modifier sits in a side apartment building and requires Catwoman to access a hidden interior route before you can collect it. Here’s how:
Red Brick location
The Red Brick is located inside an apartment building off to the side of the mission area. The building is a marked side location, and the hidden route is accessed by using Catwoman’s cat summon ability to travel through a cat flap and reach the collectible.

Because The Big Dukeroo is open-ended, the collectible can be collected in a different order from other mission items, but the apartment route is the key thing to look for. Once you spot the building, the puzzle is all about entering from the correct side and using Catwoman’s movement tools properly.
How to get the Red Brick – Showbiz Modifier
Step 1
Advance through The Big Dukeroo until you can move freely through the mission space and look for a side apartment building instead of following only the main route.

Step 2
Switch to Catwoman, since her cat summon ability is required to start the hidden traversal sequence later.

Step 3
Use the cat route to reach the apartment window.

Use Catwoman’s abilities to cut the glass.

Then pass through inside the apartment.

Step 4
Then switch to Batman and bring him inside the apartment as well.
Step 5
Use Batman to move the TV to the left.

Step 6
Summon the cat using Catwoman. Then jump up the TV.

Then up above the bookshelf, and pass through the vents.

Step 7
Follow the platforming path inside the apartment until you reach the Red Brick pickup point.

Step 8
Collect the brick to unlock the Showbiz modifier for later use in the character and suit options menus.

What does the Showbiz modifier do
Showbiz is one of the Red Bricks that changes how the game can be played after you unlock it.

Red Bricks in this game are modifier bricks, and they are applied through the character menu under Suit Options and then Red Brick Options.
That makes this collectible worth grabbing as soon as you see it, especially if you are working through mission collectibles in order. It is a quick detour once you know the apartment location and the Catwoman requirement.
The Showbiz Red Brick in The Big Dukeroo is a straightforward hidden collectible once you know the apartment location and bring Catwoman. Follow the cat flap route, grab the brick, and the modifier is yours.