It's summer, and you can tell because Big Brother is finally back!

CBS has recruited 16 new houseguests to be locked inside the house, and there's some pretty intense personalities vying for the $500,000 grand prize. The youngest competitor is a 21-year-old college student with a fear of crossing the street, and the oldest is a 40-year-old former undercover cop. There are "Vegas entertainers," fitness models and professional dancers in the middle.

Here's When Big Brother and CBS' Other Summer Series Premiere

Currently, there are no returning houseguests on the slate, but with this season being the milestone 20th season, you should expect the unexpected. Julie Chen returns as host for Season 20, which kicks off with a two-night premiere event beginning Wednesday, June 27 at 8/7c and concludes Thursday, June 28 at 9/8c.

This year CBS All Access is allowing subscribers to watch a livestream of the houseguests' first interviews Monday, June 18 beginning at 8 a.m. PT/11 a.m. PT on CBS.com, but you can get your first look at the roommates and their occupation in the gallery below.