Evacuate Outpost #31 after placing all the C4

Remove the power supply and pass through the downed fence

Conduct a blood test on everyone and head to the Norwegian Outpost with Pierce

Follow Williams to the Medical Center

Follow the mysterious person running towards the Weather Station

Exit the Weather Station and find a way to enter the Pyron Hangar

Defeat the first abomination and head for the next level

Enter the Preparation Laboratory room and progress through the complex

Escape the complex with Doctor Faraday

Use the elevator and leave the Medi-Lab

Have Dixon fix the elevator controls and head to the furnace room

Defeat the second abomination and escape the level

Exit the Hangar with Powell

Destroy every cargo and exit the level through the ductwork

Find your way to the Weapon Laboratory

Defeat the third abomination

Escape and take the elevator to the surface

Pass through the mountain corridor and find Whitely

Finish The Thing on any difficulty

Finish The Thing on hard mode