Rockstar today announced that the first episode of downloadable content for Grand Theft Auto IV entitled The Lost and Damned, is now available via Xbox LIVE Marketplace exclusively for the Xbox 360. You can check out our preview here.

“We’re thrilled to finally share the first downloadable episode of Grand Theft Auto IV,” said Sam Houser, Founder of Rockstar Games. “This vast and entirely unique first episode is packed to the brim with action, pushing the definition of downloadable content to its very limit.”

The Lost and Damned introduces players to a new narrative and protagonist that sit alongside the main story of Grand Theft Auto IV. Players will assume the role of Johnny Klebitz, Vice President of The Lost motorcycle club, as he deals with club President Billy Grey’s release from rehab and his unwavering commitment to escalating a bitter feud with rival gang, The Angels of Death.

In addition to a new narrative, players will also find new weapons, music, multiplayer modes, mini-games, vehicles and a host of other features.

Priced at 1600 MS points, Grand Theft Auto IV: The Lost and Damned requires players to have the full version of Grand Theft Auto IV.