- "TK-421, why aren't you at your post? TK-421, do you copy?"
- ―Imperial officer Treidum
When the Death Star captured the Millennium Falcon, TK-421 was ordered to guard the ship while an Imperial scanning crew determined if anyone was aboard. Responding to a call for help from inside the ship, TK-421 and another trooper were ambushed by Han Solo. Solo and Luke Skywalker then used the two troopers' armor to infiltrate the Death Star.
- Star Wars: Episode IV A New Hope (First appearance)
- A New Hope: The Princess, the Scoundrel, and the Farm Boy