Brody Jenner and Kristin Cavallari

MTV is planning to re-air Laguna Beach and The Hills as part of its weekday "RetroMTVBrunch" schedule. Additionally, the network will debut a never-before-aired alternate ending to The Hills.

Kicking off Monday, July 8 at 9 a.m. ET/PT, MTV will run their hit reality show Laguna Beach from the beginning. The first season, which premiered in 2004, launched the careers of Lauren Conrad, Kristin Cavallari and Stephen Colletti.  Beginning Tuesday, July 9, the 4-hour episode block begins airing at 8 a.m. ET/PT.

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As a special treat, on Friday, August 9 at 11:30 a.m. ET/PT, MTV will air an alternate ending to The Hills. When the series ended its 6-season run in 2010, the final scene showed Cavallari and Brody Jenner saying goodbye, before a back drop moved and depicted the green screen they were in front of as a nod to the rumors that the show was fake.

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During the marathon, current MTV stars including Awkward's Molly Tarlov and Jillian Rose Reed and Girl Code's Nicole Byer and Nessa will provide commentary.

Watch a sneak peek: