CBS has introduced the full cast of “Big Brother” 2013 as the reality series enters season 15. Houseguests this year include a railroad conductor, pizza delivery boy, lifeguard and pageant coordinator.

“Big Brother” 2013 kicked off Wednesday with some new twists. This season viewers will watch as not two, but three contestants are nominated for eviction. The second twist is that “Big Brother” fans can vote each week for the MVP of the house. The houseguest with the most votes for doing the best job that week will receive the MVP title and get “a secret power.”

The 16 new contestants will live in a camera-rigged house as they compete (sometimes viciously) for a chance to walk away with $500,000.

You can catch season 15 of “Big Brother” when it airs on CBS on Sundays and Wednesdays at 8 p.m., and Thursdays live at 9 p.m. Check out the slideshow to meet the 16 “Big Brother” 2013 contestants.