Playing alien Mork on an episode of the sitcom was a star-making role for the up-and-coming actor, whose comedic genius was evident from the moment he stepped on the set.

Their folk-rock vibes may have suggested a mellow existence, but in reality, the four members of the 1960s group led drug- and drama-filled lives during their time together.

After Lopes was killed in a car accident, the group's earlier conflicts lost their importance as the two surviving members focused on honoring their late friend.

In the groundbreaking episode, DeGeneres became the first lead character of a TV series to announce that she was gay, and the comedian faced backlash as a result.

The California band was often known more for their conflicts than their hit songs.

The country superstars and "Islands in the Stream" duet partners shared a "very special relationship" for more than three decades.

The show's groundbreaking storyline marked the first time a primetime series portrayed the lead character contemplating an abortion.

Keller and her "miracle worker" started out as pupil and teacher, but their relationship blossomed into one of lifelong support.

The African American writer shared her message of "survival" and "hope" in the 1978 poem.

Before the actors were cast as Danny and Sandy, several well-known names were at the top of the list.

In addition to freeing slaves, Tubman was also a Civil War spy, nurse and supporter of women's suffrage.

On that tragic day in 1884, the future president wrote in his diary, "The light has gone out of my life."

Finances and creative differences caused the actress to leave the show after just one season.

After receiving a letter from an 11-year-old girl suggesting he lengthen his whiskers, Lincoln became the first president to have a full beard.

After she couldn't find a solution for her own hair loss, the self-made millionaire took matters into her own hands.

Ben Affleck and Matt Damon have been friends since grade school and their enduring friendship has influenced nearly every aspect of their lives.

The activist was much more than a woman who once refused to cede her seat on a segregated bus, as she spent decades fighting for civil rights.

The director and journalist's love story began the moment they met and lasted until Nichols' death in 2014.

Actors Mary Tyler Moore and Ed Asner may be best known for appearing together in 'The Mary Tyler Moore Show,' but their connection extended far beyond their on-screen roles.

Fred and Joanne Rogers shared a long and loving relationship, which she continues to honor by carrying on his legacy after his 2003 death.

Following their historic walk on the moon, Neil Armstrong, Buzz Aldrin and Michael Collins visited the monarch at Buckingham Palace.

For more than 50 years, the country superstar has been married to a man who prefers to remain of the spotlight.

Despite many ups and downs — including two divorce filings — the pair still recorded some of the best duets in country music history.

Adopted at birth, the country singer was determined to find her "missing link."