The 2285 killing of the Project Genesis scientists who stayed aboard the Regula I laboratory when Khan arrived in the captured USS Reliant demanding the Genesis Device.
The massacre takes place in Star Trek II: The Wrath of Khan. Using Chekov and Captain Terrell, who are under the control of Ceti eels, Khan sends word to the Regula I space laboratory that the Reliant is coming to take Genesis. Dr Carol Marcus protests to Kirk in a message that is jammed.
Carol, her son David and one colleague hide the device inside the Regula planetoid by transporter. The scientists who stay behind refuse to say where it has gone, and Khan has them tortured and killed.
Kirk, McCoy and Saavik beam over from the damaged Enterprise and find the bodies hanging in the station, along with Terrell and Chekov shut in a locker. The discovery leads them to the Genesis cave, and to Khan's theft of the device.