21. In which "Star Trek" shows did they feature a ship called Defiant in at least one episode?
From Quiz Ships of the Line
Answer:
"Star Trek", "Star Trek: Deep Space Nine", and "Star Trek: Enterprise"
The first Defiant was a Constitution Class was a class 1 heavy cruiser, the same as the USS Enterprise ("TOS"). It had become trapped in an interphase between our dimension and an unknown dimension. The phasing process created irrational behavior in the crew, and they had killed each other or committed suicide. Kirk was trapped there for a while, when they could only beam one person at a time back. Eventually, Kirk was rescued, but the Defiant was lost.
It later was revealed that the Tholians of the mirror universe had sent a distress call through an interphasic rift that they'd created. It is what initially attracted the Defiant, where it was not only transported to the mirror universe, but also back in time over 100 years. The Tholians captured the now crewless Defiant, and took it to one of their drydocks. The mirror version of Jonathan Archer found out about it, led a mission to seize it, and flew it back to Earth. Before they arrived, the mirror Hoshi Sato poisoned Archer and took command of the Defiant. With a ship that had technology a century advanced that Earth, she then laid claim to the Empire.
The 24th century starship Defiant (NX-74205) was a Defiant-class prototype ship that was assigned to Deep Space Nine when its original purpose as an anti-Borg ship was abandoned. It was equipped with a Romulan cloaking device, which was to be used only in the Gamma Quadrant, to aid in intelligence gathering about the Dominion and the Founders.
It served several years for the space station, but ultimately was destroyed with 310 other Starfleet ships during Second Battle of Chin'toka. Another Defiant-class ship, the Sao Paulo, was assigned to Deep Space 9. Captain Sisko received special dispensation to rename it Defiant.
The first Defiant of "DS9" also made an appearance in "Star Trek: First Contact". Worf was in command, joining the attack against a Borg cube that was poised to attack Earth.