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LEGO Batman Legacy: Firefly Mission 13 Walkthrough

Stuck on Mission 13: Firefly in LEGO Batman: Legacy of the Dark Knight? This complete walkthrough guides you through every step of the Knight at the Museum mission – from Batgirl’s Hackarang tutorial to fuelling the rocket in the Space Exhibition. You’ll also find every collectible location, including all 5 Spaceships, 5 WayneTech Caches, and the Red Brick: Fire Breather.

Related Guides:
Mission 12: Poison Ivy
LEGO Batman: Legacy of the Dark Knight Hub


Every mission rewards a yellow Skill Brick at the end.

How to Replay a Mission

In case you didn’t find all collectibles in the first story playthrough, don’t worry. You can still get it. Play the story to Mission 6: Shreck’s Department Store, where you restore the Batcave.

Then, travel to the Batcave and interact with the computer at the top, next to the red batphone. Here you can select the mission you would like to play again.

How to Replay a Mission Computer - Lego Batman Legacy of the Dark Knight camzillasmom.com
How to Replay a Mission Computer List - Lego Batman Legacy of the Dark Knight camzillasmom.com

You will also see the status. If the box is ticked: Congratulations, you’ve found all the collectibles in this mission. If not, there is still work to be done!

Batcave Trophy: Spaceships

Find and destroy 5 Spaceships in Firefly, Mission 13, to receive the Batcave Trophy: Spaceships. Each adds up to the total of 170 Trophy Collectibles. Therefore, you will have 5 of 170 Trophy Collectibles after destroying all five Spaceships

Here’s where they are:

Red Brick: Fire Breather

Before entering the code to reach the last room of the mission, the Space exhibition, head to the planetary exhibition to the right. Turn all four planetary displays to Mars, the red planet. The globe in the center will open to release the Red Brick.

Red Brick - Find a Way to Open the Door - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Caches

There are five WayneTech Caches hidden in Mission 13: Firefly. Here’s where:

Go to the Bat Signal

Return to the Bat Signal at the top of the GCPD building and interact with it to continue with the story.

Batsignal - map - Chapter Three Complete - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Batsignal - location - Chapter Three Complete - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Go to the Gotham Museum

The Gotham Museum is in the Newtown district on Central Island. Interact with the door to start Mission 13: Firefly.

Gotham Museum - map - Chapter Three Complete - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Gotham Museum - location - Chapter Three Complete - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Open the Security Door

The mission starts with a tutorial for Batgirl’s Hackarang. It can be thrown to control machines and other technology. Throw it at the door panel to start the hacking minigame. Move the yellow bat to the center to override the controls. Then you can raise the shutters.

Hackarang Tutorial - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Hackarang Minigame - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Save 3 Partygoers

Save the partygoers straight ahead by throwing a Hackarang at the whale controls. Then, move the whale to the left and “Spray Water” on the fire.

Hackarang Whale - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Hackarang Whale Water - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Fun: Purple Stud

Grapple up the Brontosaurus‘ head to find joy and a Purple Stud.

Brontosaurus - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

The second partygoer to be saved is on the upper left of the room, trapped behind the fire. Use Batgirl’s Hackarang to hack the crab hanging from the ceiling. Move it over to the partygoer and grab them.

Person 2 Hackarang - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Person 2 save - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Cache 1

Grapple up to the exhibit next to the previous partygoer to find a WayneTech Cache in flames. Switch to Batman to use the Bat Claw on the yellow grapple plug above the WayneTech Cache.

WayneTech Cache 1 of 5 Grapple - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
WayneTech Cache 1 of 5 Bat Claw - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Cache 2

On the other side, to the right of the third-party goer that has to be rescued, move the brown walls to reveal another WayneTech Cache.

WayneTech Cache 2 Move Brown Walls - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
WayneTech Cache 2 - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Batcave Trophy: Spaceships 1 of 5

The first Spaceship is next to the partygoers at the top right.

Spaceships 1 of 5 - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

To serve the last partygoers, look for the mammoth exhibit behind them. There is a yellow plug for Batman’s Bat Claw. Pull on it to remove the cover of the mammoth controls. Use Batgirl’s Hackerrang to hack the mammoth, saving the last of the three partygoers. The story continues with Batman and Batgirl investigating the banging on the door, where Firefly emerges, disappearing into the now broken ceiling.

Batman Mammoth - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Batgirl Mammoth - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Follow & Find Firefly

Batgirl’s Drone is introduced. It can transform into a grapple point – useful when having to grapple greater heights. Summon the drone and fly it up through the silver stud diamond and transform it into a grapple point. Now you can grapple up through the hole in the ceiling.

Batgirl Drone - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Batgirl Drone Grapple - Save 3 Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Cache 3

You can put that drone to the test right away when arriving in the next area. There is a line of golden studs to the top right. Deploy the drone, fly up, and transform it into a grapple point. Grapple up there to open the WayneTech Cache.

WayneTech Cache 3 Studs - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
WayneTech Cache 3 Drone - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

After grabbing the WayneTech Cache, move the drone over to the blocked passage in the center of the silver stud diamond to transform it into a grapple. Now the two heroes can cross and move to the next room.

Drone over obstacle - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Drone Next Area - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Save the Partygoers

In this room, there are three partygoers hanging from a cage. Let them hang for now and go for the collectibles first.

Hanging Cage Partygoers - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Cache 4

On the right side, ground floor, there is a WayneTech Cache hidden behind some boxes.

WayneTech Cache 4 - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Purple Stud Display

On the other side of the room is a purple stud in a glass showcase that requires a key. The key is in the box next to the previous WayneTech Cache.

Purple Stud Stowcase - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Batcave Trophy: Spaceships 2 of 5

In the same area as the previous WayneTech Cache, look up to the left. There is a Spaceship on top of the building.

Spaceships 2 of 5 - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

To save the partygoers hanging from the cage, summon the drone and fly it to the diamond-shaped studs. If the drone breaks in front of the ship, move to the tiled floor areas to summon it. Create a grapple point next to the ship to board it. At the top deck is a box with a padlock that can be destroyed.

Drone to board the Ship - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Ship Box Padlock - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Drop down into the hole to retrieve the Ship’s Wheel. Stand on the brown button to exit. Use it to save the partygoers. From the pieces on the deck, build a cannon and use it to blow open the door on the other side. Keep shooting at LEGO objects to harvest studs.

Ships Wheel - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Ships Wheel Use - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Find Firefly

Firefly is behind the door but escapes again. Follow them to the next room, where the floor is lava. Summon the drone with Batgirl to build a perch point, where the diamond-shaped silver studs are, to reach the other side.

Floor is Lava - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Floor is Lava drone - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Batcave Trophy: Spaceships 3 of 5

You can see the next Spaceship while sitting atop the drone. It’s on top of the big LEGO statue’s top hat.

Spaceship 3 of 5 - Floor is Lava drone - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Use the bridge to cross over to the other side, then build another drone-perch point to reach the exit going to the gift shop. Firefly is waiting at the gift shop’s exit.

Last Steps Lava Room - Floor is Lava drone - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Last Steps Lava Room Perch Point - Floor is Lava drone - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Purple Stud

Use Batgirl’s Hackerrang on the cash register.

Gift Shop Till - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Batcave Trophy: Spaceships 4 of 5

The fourth Spaceship is well concealed on one of the Space Shuttle posters in the gift shop.

Spaceship 4 - Find Firefly - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Find a Way to Open the Door

The door to the Space Exhibition closes behind Firefly, them escaping again! Before following blindly, have a look around.

Space - Find a Way to Open the Door - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

WayneTech Cache 5

The last WayneTech Cache is on top of the ticket office. Summon a drone to reach it.

Space Ticket Office - Find a Way to Open the Door - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Space Ticket Office Top - Find a Way to Open the Door - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Red Brick: Fire Breather

On the other side is a planetary exhibition. There is something odd about the pictures on the walls. Only one planet has a golden frame: Mars! Set all the planets in the center to display the red Mars. The globe will open, releasing the Red Brick.

Space Red Mars - Find a Way to Open the Door - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Red Brick - Find a Way to Open the Door - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

The terminal next to the space exhibition door requires a code. Summon Batgirl’s drone and fly inside the ticket office to scan the pinboard at the back. You will learn the code. Enter it in the terminal to open the door.

Fly inside ticket office - Find a Way to Open the Door - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Fly inside ticket office Pinboard - Find a Way to Open the Door - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Fuel the Rocket

Enter the Space exhibition to find Firefly.

Space Exhibition - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Batcave Trophy: Spaceships 5 of 5

The last Spaceship is part of the turning mobile in the center.

Spaceship 5 of 5 - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

To fuel the rocket, grapple across to the left, where the fuel sign is. Use Batgirl’s Hackarang to get access to the control wheel. Use it to fuel the rocket.

Cross over left - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Cross over left Control Wheel - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Grapple over to Mission Control and use a drone’s perch point to get inside. Inside is a lever you can pull to activate the rocket controls. Return to the entrance to press the button.

Mission Control - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com
Mission Control Drone - Knight At the Museum - Mission 13- Lego Batman Legacy of the Dark Knight camzillasmom.com

Completing Mission 13: Firefly, grants:
-> 1 Skill Brick (Yellow Brick)

Suits Collectibles:
-> 1x Batman (Gotham by Gaslight)
-> 2x Batgirl (The New Batman Adventures & Batman: The Animated Series)

Vehicle Collectible:
-> 1x Batman (Gotham by Gaslight)
-> 2x Batgirl (The New Batman Adventures & Batman: The Animated Series)

Additional Collectibles:
-> Batcave Trophy: Spaceships
-> Red Brick: Fire Breather
-> 5 WayneTech Caches

Collectibles - Mission 13 Firefly- Lego Batman Legacy of the Dark Knight camzillasmom.com
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About LEGO Batman: Legacy of the Dark Knight

Release: May 22nd, 2026
Developer: TT Games
Publisher: Warner Bros. Games
Official Website: https://legobatmangame.com/