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.
The Prohibition movement is represented by Wayne Wheeler. Barriers in news broadcasting are broken by Dorothy Fuldheim. Boxer Muhammad Ali publicly protests the Vietnam War by refusing to serve.
In World War II, Virginia Hall takes on the dangerous role of being a spy behind enemy lines. The fight against the Axis powers is aided by British intelligence officer Roald Dahl. The Union army receives useful war information from Harriet Tubman.moreless
The British is defeated during the War of 1812 with the help of Pirate John Lafitte, a look at banana kingpin Sam Zemurray, and the legend of jazz musician Louis Armstrong.
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.
Rival paleontologists Othniel Marsh and Edward Cope clash. The Big Bang's echo is discovered by Penzias & Wilson.
Niece Denise calls in help from Nash Rickey when she has a karaoke bully, Murph from Pawnsylvania is getting married, and the sitcom "Chairs" featuring Larry Bird.
Frances Cleveland is made the nation's youngest first lady, following Woodrow Wilson's stroke his wife Edith runs the country, and numerous historical items are saved by Dolley Madison.
Jim Thorpe becomes the best athlete of the 20th century, gender barriers in sports are broken by Babe Didrikson, and Jim Abbott becomes a prominent pitcher even though he has only one hand. Guest starring Jason Momoa, Zach Gilford and Emily Deschanel.moreless
Baron von Steuben helps train the Continental Army during the American Revolution; John Adams and Thomas Jefferson campaign for president; Benedict Arnold switches sides to fight against George Washington's army.
James Cook parties with the locals after "discovering" Hawaii, Japanese-American Daniel Inouye serves with honor during WWII, and the world of surfing is changed by Eddie Aikau. Guest starring Ken Marino, Jason Mantzoukas and Steven Yeun.moreless
Orson Welles' "Citizen Kane" angers publisher William Randolph Hearst; animator Ub Iwerks helps Walt Disney create Mickey Mouse; Nancy Reagan urges her husband to get into politics.
Charles Sumber is caned while on the Senate floor, the end of segregation is helped by Judge J. Waties Waring, and a Confederate warship is commandeered by a slave named Robert Smalls. Guest starring Patton Oswalt, Johnny Knoxville, Busy Phillips and Brandon T. Jackson.moreless
Abraham Lincoln tries to stay alive on the way to his inauguration; Francis Scott Key pens "The Star-Spangled Banner"; Edgar Allan Poe clashes with Rufus Griswold.
Disc jockey Alan Freed plays rock and roll for the first time; Kris Kristofferson gets his big break with some help from Johnny Cash; music producer Sylvia Robinson assembles the Sugarhill Gang.
Sculptor Fréderic-Auguste Bartholdi designs the Statue of Liberty; Sybil Ludington takes her midnight ride during the American Revolution; Nellie Bly goes undercover in an asylum on Blackwell's Island.
American boxer Joe Louis faces off against German boxer Max Schmeling, Claudette Colvin sits down for civil rights when she refuses to give up her seat on the bus, and Percy Julian knocks down racial barriers in the field of science.moreless
Hold-outs fight to the bitter end at the Alamo, Billy the Kid goes on the run from lawman Pat Garrett, and Teddy Roosevelt rounds up the Rough Riders and goes to war. Guest starring Jake Johnson, Chris Parnell, Andy Daly and more.moreless
Lewis and Clark explore the dangerous west, evolution is questioned in the controversial "trial of the century," and Dolly Parton has to leave the man who made her famous. Guest starring Tony Hale, Aubrey Plaza, Jack McBrayer and more.moreless
Ralph Nader goes to war with General Motors, Houdini, and Sir Arthur Conan Doyle go from best friends to bitter rivals. The Kellogg Brothers invent cereal, but battle each other. Guest starring Owen Wilson, Alfred Molina, Jason Schwartzman, and more.moreless
Patty Hearst gets kidnapped and brainwashed. Mark Twain flees the city in fear and finds his unlikely first hit story. Guest starring Kristen Wiig, Terry Crews, Lisa Bonet, and more.
Mary Dyer wages war with the Puritan establishment, two cunning thieves pull off a $500 million art heist, & the most notorious arsonist in New England history is revealed. Guest star: Winona Ryder, Michael Cera, Nick Offermanmoreless
John Pemberton invents Coca-Cola from wine and cocaine, the FBI tries to take down Martin Luther King Jr., and Stetson Kennedy infiltrates the Ku Klux Klan. Guest starring Bill Hader, Simon Helberg, Kevin Nealon and more.moreless
Al Capone gets destroyed by an unlikely enemy, prairie lawyer Abraham Lincoln gets a huge break, and the police go to war with protestors during the Haymarket Riot. Guest starring Ike Barinholtz, Joe Lo Truglio, Matt Besser.moreless
Woodward and Bernstein blow open the Watergate scandal, actors/brothers Edwin and John Wilkes Booth engage in a tragic feud, and Elvis crashes the White House to meet Nixon. Guest starring Jack Black, Dave Grohl, Bob Odenkirk.moreless
Jane urges Alex and Dave to come clean with each other since it's the first anniversary of their almost-marriage. Penny buys an "amah-zing" condo which she feels will turn her life around.