TK-421/Legends

TK-421 is the name of one of the Stormtroopers who was guarding the Millennium Falcon while captured in Death Star I. He and his counterpart TK-422 were summoned up the ramp, and then shot by Han Solo. His Stormtrooper armor was then taken by Luke Skywalker and used to sneak through the Death Star.

Behind the scenes
In the novelization of the movie, the trooper was referred to as THX-1138, in an homage to one of George Lucas' previous films.

It is speculated that TK refers to the type of trooper, and 421 is the serial number for troopers of that type.

TK-421 was the only stormtrooper to receive a designation in any of the three original trilogy movies.

TK-421 has become an easter egg (virtual)|easter egg of sorts mentioned in various places such as the movie Boogie Nights.

In the video game Star Wars: Jedi Knight II: Jedi Outcast, a homage to TK-421 is included. In the Cairn Station stage, the player will eventually enter a control room marked by six trip-mines in the entryway. If he moves towards a static-filled screen, he can hear a British-accented human speak:

TK-664, what is your status? TK-664, report!

In the same game in multiplayer the name "TK-421" is used for the Stormtrooper outfit, too.