Broken Steel is the third downloadable content pack for Fallout 3 and features increased level cap, new weapons, and a continuation of the main quest.
 

Continue your existing Fallout 3 game and finish the fight against the Enclave remnants alongside Liberty Prime. Broken Steel moves the level cap for your character from 20 to 30, allowing you to experience even more of the game, including new perks and achievements.
 
Story: You may have dealt the Enclave a serious blow at Project Purity, but their forces are still out there, and still pose a grave threat to the people and security of the Capital Wasteland. In Broken Steel, you'll continue your current Fallout 3 character past the events of Project Purity, and work with the Brotherhood of Steel to eradicate the Enclave threat once and for all. Travel to new locations like the Olney Powerworks, wield destructive new weapons like the Tesla Cannon, and fight powerful new creatures like the Super Mutant Overlord. POINT LOOKOUT: Point Lookout opens up a massive new area of the Wasteland – a, dark, murky swampland along the coast of Maryland. So hop on the ferry to the seaside town of Point Lookout, for the most mysterious and open-ended Fallout 3 DLC adventure yet. Story: Buy a ticket and hop on board the Duchess Gambit, as Tobar the Ferryman takes you to the strange seaside town of Point Lookout. What secrets does the dilapidated boardwalk hold? Who lives in the sprawling mansion? Why is the Punga Fruit so important? And what horrors lie in the depths of the murky swamp? Point Lookout is the most open-ended DLC yet, and allows you to explore a huge, swampy wasteland any way you'd like. A completely new quest line allows you uncover the town's hidden secrets and wield powerful new weapons like.