• Unlockable Characters: Gambit
• Level Bosses: Marrow
• Items: Comic Book: Storm, Sketchbook: Morlock Tunnels, Danger Room Disc: Focus 201, Sketchbook: Rogue and Gambit, Danger Room Disc: Focus 202, Danger Room Disc: Challenge Rogue
• Objectives:
    * Rescue Gambit
    * Locate and Talk to Morlock Healer
    * Locate and Talk to Marrow

Use the Extraction point to save your progress. After the Extraction point, you will need to break the wall to continue searching. You can either use the explosive can or use one of the capable X-Men to do the job. But beware, once the wall is opened, Morlocks Brutes and Morlock Claws will come to the attack.

  
Level 1.5.2: Mainline Reservoir

Morlock Giants attack as you enter this new area. Continue forward, fighting Morlocks along the way, until you see the Extraction Point along with two exit doors in this area. Head to the Extraction Point and make sure to have an X-Men with the ability to create bridges as it will be needed in the next area. Save your progress and head to the door closest to the Extraction Point.

  
Level 1.5.3: East Trunk Line

More Morlocks await you as you enter this level. Finish them off, switch to an X-Men that can create bridges and use it near the glowing blue X to cross to the other side to pick up Comic Book: Storm at the end of the path. Return over the bridge and head to the door into a new hall.

Continue forward in this level. Groups of Morlocks will be attacking. Make sure you finish them off before continuing, otherwise you will be overwhelm with even larger groups along the way. Take the door at the end of an open area, and fight more enemies across a bridge. Head to the right and destroy the wooden boxes to obtain Sketchbook: Morlock Tunnels.

Head back and take the doorway into the next area. Break the wall and attack the pump, marked by a read arrow, until it is completely destroyed. Then, go all the way back this level until you return to the Extraction point. Save your progress, and this time, take the second doorway. 

  
Level 1.5.4: West Trunk Line

Again, group of Morlocks await your arrival. Make sure you cross the bridge to pick up the Danger Room Disc: Focus 201. Return over the bridge and head to the left. Make sure you finish off the enemies before continuing walking the path! As you continue, look for a yellowish barrel, which is a warning against a spike trap. Keep moving along until you get to the second pump. Destroy it, and continue through the hall until you reach a new doorway. Keep walking along, you will reach another spike trap, and head back to the Mainline Reservoir area once more. 

 
Level 1.5.5: Mainline Reservoir (Haven)

Save your progress. You will noticed that there is no more water, and a deeper area is now available. Head down and enter the new doorway. Your objectives will now be to find the Healer and Marrow, but you may speak to the Morlocks along the way. Heading to the left, you will find the Healer. Talk to him, and you will now have the Healer Shop available in Xtraction Points just like Forge. If you missed any of the Danger Room Discs, you may purchase them here, although they are a bit expensive.

After talking to the Healer, head to the right, where you will find Marrow. After talking to her, face away from her (towards the entry point), and turn left to take the bridge back across the Morlocks. Turn left and walk close to the wall until you see a door that will open. 

    
Level 1.5.6:

Make sure to save your progress using the Extraction Point before continuing (also, make sure you have a flying or teleporting X-Men as it will become handy in area following this one.) As you pass through the bridge, you'll find a door. Enter the room and break the wall. You will see a hidden room that has Sketchbook: Rogue & Gambit, hidden among some wooden boxes. Grab it and continue your path forward, but watch for the spike trap right ahead.

This time, a new Morlock will be among the group of enemies, the Morlock Goth, a thin, black-haired Morlock that has the ability to revive fallen friends. Make sure you take the Goths first, otherwise, it could become a never ending battle. Keep going forward, fighting enemies and breaking barrels for health and energy packs, until you reach the door for next area. 

  
Level 1.5.7: Filtration Reservoir

As you go through this area, you will find two Goths, one on each "island area". Use a flying or teleporting X-Man to head to each of these areas and finish off the Goths. Once you finish the one on the left, destroy the wooden boxes, which hide Danger Room Disc Focus 202. Once both Goths are gone, it will be easier to fight the rest of the enemies. At the end of this area, make sure you save your progress using the Extraction Point before continuing. Head out of the Extraction Point room (opposite the entrance), and fight the enemies across to finish the objectives.

 
Level 1.5.8: Rescue Gambit

This level is just one big open area. As you enter, use one of your flyers to head forward to the left-back corner of the area where you will find Danger Room Disc: Rogue hidden within the wooden boxes. Head back to the center of the area to meet the rest of the team and get ready to confront Marrow.

  
BOSS: Marrow

Marrow's main attack is by either throwing small group of spikes in front of her, or by jumping and scattering spikes in all directions. Try to stay behind her to avoid her first attack, and run away from her as you see her about to perform her second attack. 

The area is scattered with explosives, which can bring great damage to X-Men who come into contact. Use Storm's Whirlwind or Jean's Telekinesis to move the explosives out of the way.

Best attack against Marrow are long range attacks such as Cyclops' Optic blast. You can also use Iceman to slow her down, or Wolverine to bring her great damage.

Once you defeat Marrow, Gambit will join your team.