Abigail Spencer (Mad Men) has signed on to co-star in Jon Favreau's upcoming action sci-fi western, Cowboys & Aliens.  Spencer joins Daniel Craig, Olivia Wilde, Sam Rockwell, Paul Dano, Clancy Brown, Walton Goggins and Harrison Ford.  The plot centers on cowboys and Indians teaming up to fight against alien invaders.  According to Heat Vision, "Spencer will play a prostitute named Alice, a former lover of Craig's character who makes him change his ways."  People need to remember that whores don't just turn tricks...they turn hearts.

Hit the jump for the official synopsis.  Cowboys & Aliens is set to open on July 29, 2011.

Here's the official synopsis for Cowboys & Aliens:

1873. Arizona Territory. A stranger (Craig) with no memory of his past stumbles into the hard desert town of Absolution. The only hint to his history is a mysterious shackle that encircles one wrist. What he discovers is that the people of Absolution don’t welcome strangers, and nobody makes a move on its streets unless ordered to do so by the iron-fisted Colonel Dolarhyde (Ford). It’s a town that lives in fear.

But Absolution is about to experience fear it can scarcely comprehend as the desolate city is attacked by marauders from the sky. Screaming down with breathtaking velocity and blinding lights to abduct the helpless one by one, these monsters challenge everything the residents have ever known.

Now, the stranger they rejected is their only hope for salvation. As this gunslinger slowly starts to remember who he is and where he’s been, he realizes he holds a secret that could give the town a fighting chance against the alien force. With the help of the elusive traveler Ella (Olivia Wilde), he pulls together a posse comprised of former opponents—townsfolk, Dolarhyde and his boys, outlaws and Apache warriors—all in danger of annihilation. United against a common enemy, they will prepare for an epic showdown for survival.