Corporate Lockdown is the 1st add-on for the game Alien: Isolation, expanding the Sevastopol's story, taking place some days before Amanda Ripley arrives, making it a prequel.
The story is about Seegson Executive Ransome that is trying to escape the ship, taking decoded Nostromo data with him. The aim is to stop him. The game adds three new challenge levels: Severance, Scorched Earth and Loose Ends.
The add-on also introduce Gauntlet mode, there the player can try to complete all three survivor challenges in a row without dying.