What to Watch on Tuesday: Shark attack cost surfer his leg, but it didn’t stop him

Big Brother (8 p.m., CBS) - Season 21 of “Big Brother” begins. No North Carolina on this season.

Real Sports with Bryant Gumbel (10 p.m., HBO) - Surfer Colin Cook designed a surfing-specific prosthetic for himself after he lost his left leg during a shark attack in Oahu more than three years ago. Cook now dominates the adaptive surfing competitions across the country. The segment also features Cook’s girlfriend, Sydney Corcoran, a victim of the Boston Marathon bombing.

Tiananmen: The People vs. The Party (9 p.m., PBS / UNC-TV) - In conjunction with the 30th anniversary of the Tiananmen Square Massacre, this documentary tells the story of the pro-democracy movement and demonstration that ended with brutal violence and set the stage for modern-day China.

Some programming descriptions are provided by networks.