Kirk tries to reason with the human side of Nurse Chapel's fiancé, Roger, before he and his android are zapped away. This clip is from the episode "What Little Girls Are Made Of" of the legendary series Star Trek.

The Enterprise crew rescues con artist Harry Mudd and then is in for quite a surprise when they bring his crew aboard as well.

Nurse Chapel is reunited with her fiancé; but his new obsession leads him to make an android duplicate of Captain Kirk.

In this scene from the Star Trek episode "The Enemy Within," a transporter malfunction creates an evil Kirk, who proceeds to come aboard the ship.

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.