Caption: The Jenolen, on the surface of the Dyson sphere
An older class of Federation starship, the Jenolen disappeared in 2294, leaving no word as to its whereabouts and presumed lost.
In 2369, the Enterprise-D discovered that the Jenolen had in fact crashed into a Dyson sphere, killing all of the crew save for one, who managed to keep his pattern suspended in the modified transporter buffer for the 75 years since the ship's disappearance.
His name was Captain Montgomery Scott.
Once Mr. Scott was retrieved from the buffer, Enterprise engineer Geordi La Forge and Scotty worked together to repair the Jenolen's systems, in order to help Enterprise escape from the same fate that the Jenolen faced.