After the Enterprise crew catch a virus that removes their inhibitions, one crew member rambles angrily about how humans don't belong in space and threatens Sulu with a knife.

In the Star Trek episode "The Enemy Within," the Enterprise crew finally get rid of an evil version of Captain Kirk using the transporter.

Kirk tries to literally slap Spock into helping him save the ship, but Spock, infected with the virus, can only lament about spending a whole lifetime learning to hide his feelings. Suddenly, Kirk also seems to be acting strangely.

In these scenes from a 1967 episode of the classic American sci-fi series Star Trek, Captain Kirk is held prisoner and Spock mounts a daring rescue.

Captain Kirk finds himself in Olympus, and face to face with the Greek god, Apollo... or so it would seem! But what might a classical deity want from the stunned and bemused Star Trek crew?

Captain Kirk’s crew has stolen a cloaking device from the Romulans, but when they attempt to hold the Romulan Commander hostage, they find out just how dangerous she is.

A mysterious visitor, Seven, tries to convince Captain Kirk to let him disarm a nuclear missile/warhead that is heading for Earth. With Spock unable to do it himself, the crew is left with no choice but to trust him.

When humanoids with powers to control the ship challenge the order of command, Kirk must maintain his authority and keep them firmly in line, all while calming the nerves of his anxious crew.

Over the course of human history, thousands of languages have developed from what was once a much smaller number. How did we end up with so many? And how do we keep track of them all? Alex Gendler explains how linguists group languages into language families, demonstrating how these linguistic trees give us crucial insights into the past.

"You're a fishmonger!" By taking a closer look at Shakespeare's words, and particularly his insults, we can see why he is known as a master playwright whose works appeal to audiences all over the world.

When we look at insults used in Shakespeare's play "Romeo and Juliet," we get a new insight into dynamics between the characters and how they relate to the development of the story.

When hit US sitcom That '70s Show finally ended its long and successful run, the actors came together to reminisce and relive the good times and best moments. How did it all get started? Did any of them ever dream that the show would be so popular?

Looking back at the pilot episode from all those years ago, the actors explain why the show made audiences of different ages laugh, and cringe at their own acting skills.

Eric finds that the road to happiness is not without a few bumps as his and Donna's teenage romance becomes an adult relationship.

The cast hadn’t met before filming the show, but there was a good chemistry between them right from the start. When they got together and were having a good time, the viewers knew it, and very soon were also having a good time watching.