Episode 4

Twelve of Naked and Afraid's toughest and most experienced all-stars take on South Africa's punishing Oribi Gorge in a completely new type of challenge. For the first time ever, survivalists will compete head-to-head through a grueling, multiphase challenge and have their primitive skills tested for the chance to win $100,000. The competition is fierce, as survivalists can use any means necessary - even sabotage - to take home the grand prize. At the end of 45 days, only one can be crowned the Last One Standing.

The First Dates restaurant throws open its doors to single people looking for love.

Sister Wives explores the complex daily life of a polygamist family. Sister Wives introduces audiences to husband Kody -- along with his three wives; Meri, Janelle and Christine and their combined 13 children -- showing how they attempt to navigate life as a "normal" family in a society that shuns their lifestyle. From their unconventional family structure and living arrangements to financial challenges, each half hour episode exposes the inner workings of a polygamist household, revealing the unexpectedly tight-knit and loving relationships between Kody's wives.

Series in which budding entrepreneurs get three minutes to pitch their business ideas to five multi-millionaires willing to invest their own cash.

20/20 continues to combine hard-hitting investigative reports, newsmaker interviews and compelling human interest and feature stories.