TV Guide Showtime Extreme Sunday

High school students concerned about their teachers' odd behavior discover that the school's entire faculty has been taken over by parasites from outer space.

On a backpacking trip through the Canadian wilderness, a couple gets lost and discovers that they are in a combative black bear's territory.

Three astronauts must perfect the slingshot technique they need to catapult them to their destination or be left wondering forever in space.

When a man discovers the dead body of his mistress in his pool, he rushes to hide her body nearby when he is forced to host a large gathering at his house.

Three stories about the world of opioids converge, including a drug trafficker who arranges a multi-cartel drug smuggling operation between Canada and the U.S.

U.S. soldiers are tasked with escorting a man from the French resistance inside enemy territory so that he can assassinate a high-ranking SS officer.

Following an armed takeover of the Iranian embassy in London in April 1980, an elite group of highly trained SAS soldiers prepare for a groundbreaking action.

When a woman and a man meet up during a night on the town, the woman is forced to run for her life after the man suddenly turns violent and deranged.

Two private detectives from a tough Boston neighborhood begin an investigation into a girl's disappearance and run into a web of corruption.

In 1942, an intelligence officer meets a French Resistance fighter, and when they are reunited in London, they're relationship is threatened by war.

Two estranged brothers decide to rob the bank that is threatening to foreclose on their land, but they are chased by a Texas Ranger and his partner.

While away from his wife and newborn, the deadliest sniper in U.S. history questions every kill shot as targets include men, women and children.

A simple farmer manages to become a legendary hero as he mounts a grassroots resistance against England's tyrannical occupation of Scotland.

A rogue crew of the world's top assassins infiltrate a ruthless underground tournament in order to take down the mastermind that is pulling the strings.

A one-man fighting force heads into Afghanistan where he blows things up single-handedly in an effort to rescue a friend from a military stronghold.

A high school basketball player on his way to achieve success is faced with a habitual liar and gambler father who threatens to destroy his career.