You were describing the plot of “Caretaker”, the pilot of Star Trek: Voyager.
An alien abducts ships from one part of the galaxy to this side of the galaxy. Why? Because they are dying and are looking for a compatible mate. Unable to do so, they destroy the device that brought them there (at the wish of The Caretaker) to protect another alien species. So they get stranded 30,000 light years from Earth.
You were describing the plot of “Caretaker”, the pilot of Star Trek: Voyager.
An alien abducts ships from one part of the galaxy to this side of the galaxy. Why? Because they are dying and are looking for a compatible mate. Unable to do so, they destroy the device that brought them there (at the wish of The Caretaker) to protect another alien species. So they get stranded 30,000 light years from Earth.