This is the first good, long look we're getting at The Host, the movie version of Stephenie Meyer's novel about an alien invasion that takes over the bodies of humans. When one human host won't vacate her old shell, love happens. Honestly, this trailer does make the whole thing look pretty fun. And the resistance caves are pretty gorgeous. Let's hope Saoirse Ronan can make the "two minds in one body" thing work.

Here's the official rundown:

What if everything you love was taken from you in the blink of an eye? "The Host" is the next epic love story from the creator of the "Twilight Saga," worldwide bestselling author, Stephenie Meyer. When an unseen enemy threatens mankind by taking over their bodies and erasing their memories, Melanie Stryder (Saoirse Ronan) will risk everything to protect the people she cares most about - Jared (Max Irons), Ian (Jake Abel), her brother Jamie (Chandler Canterbury) and her Uncle Jeb (William Hurt) , proving that love can conquer all in a dangerous new world.

The Host will open in theaters on March 29th, 2013.