The CGI trailer aired in full on US TV last nigjht, during an episode of The Walking Dead.
As you can see, the video features an all-out attack on Earth by the ancient alien race known as the Reapers. A Mass Effect 3 demo launched last week, covering this section of the game.
A co-op portion of the demo also opened to all on Friday.
“I’m incredibly proud of what the team has accomplished with Mass Effect 3, and am very excited for fans around the world to experience something really special when they play the demo,” said Casey Hudson, executive producer of the series.
Mass Effect 3 hits UK shops on March 9 for PC, PS3 and Xbox 360.