Before there were parenting blogs, trophies for showing up, and peanut allergies, there was a simpler time called the '80s. For geeky 11-year old Adam these were his wonder years and he faced them armed with a video camera to capture all the crazy.

The best of the reality series crop is back, with 12 teams of 2 players each racing around the world, trying not to be eliminated at a series of checkpoints in which the last team to arrive is booted from the show. CBS chooses teams with relationships containing at least some tension, especially when the situation involves intense pressure. This season includes such duos as two circus clowns, a gay married couple, a father and son, a recently engaged couple, married couples, and best friends.

The heartbreaking, mystifying and unbelievable stories of loved ones who have disappeared and the families that never give up hope. Some stories remain unresolved; some reveal tragic endings and others have surprisingly upbeat resolutions. All of them are propelled by unpredictable twists and turns.

District 21 of the Chicago Police Department is made up of two distinctly different groups. There are the uniformed cops who patrol the beat and go head-to-head with the city's street crimes. And there's the Intelligence Unit, the team that combats the city's major offenses - organized crime, drug trafficking, high profile murders and beyond.