Paleontologists Othniel Marsh and Edward Cope become rivals, and Penzias & Wilson discover the echo of the Big Bang. Featuring Greg Kinnear, Stephen Merchant, Justin Long, Jason Ritter, Tony Hale and Christopher Meloni.

The cocaine trade in Miami is taken over by Griselda Blanco; Clark Gable joins the U.S. Army Air Forces during World War II; Ponce de León clashes with Diego Columbus.

Sam Zemurray makes a fortune in the banana trade; pirate Jean Lafitte helps Andrew Jackson beat the British during the War of 1812; Louis Armstrong becomes a jazz legend.

Virginia Hall works as a spy behind enemy lines in France during World War II; and intelligence officer Roald Dahl aids the British war effort against the Axis powers. Also: Harriet Tubman supplies the Union army with information that could turn the tide of the American Civil War.

A campaign for Prohibition is waged by the Anti-Saloon League; Dorothy Fuldheim becomes a legend in TV news; Muhammad Ali refuses to fight in Vietnam.

Board games become popular thanks to Milton Bradley; a pinball banned is overturned with help from Roger Sharpe; Bobby Fischer beats Boris Spassky at chess during the Cold War.

A land claim in Oklahoma is made by Kentucky Daisy; astronaut Gordon Cooper goes on a space mission; Deputy U.S. Marshal Bass Reeves becomes the inspiration for the Lone Ranger.

Thomas Nast's political cartoons help take down Tammany Hall's "Boss" Tweed in the 1870s; journalists Nellie Bly and Elizabeth Bisland race each other around the world in 1889.

Vigilantes led by Andres Pico enact street justice, Rin Tin Tin becomes the world's biggest movie star, and the construction of the L.A. aqueduct brings riches to city officials. Featuring Jack Black, Kyle Gass, Ryan Phillippe and Giancarlo Esposito. -- (C) CC

Popé leads the Pueblo Revolt against Spanish colonizers in 1680; Boy Scouts cofounder Ernest Thompson Seton tracks a wolf; the true story of the Roswell UFO conspiracy is revealed.