The Energy Transfer Device, often referred to as the Alien Healing Machine was a device, which had the original purpose of punishment for convicted criminals. The device would transfer the life force of one person to another. If it is used on a low setting it can be used to heal one person while only draining some life force from the other user. If used on the maximum setting or if the other party is severely injured, the device can kill the other user.
The device was first discovered by Stephen Franklin in 2258 when he found out that unauthorized medical services were being provided in Down Below by Dr. Laura Rosen. Karl Mueller, a convicted murderer, tried to use the device to heal his wounds, but was killed by Dr. Rosen when she sucked his life-force from him. Although Dr. Rosen was cleared in court for this homicide as a justified case of self-defense, she was ordered to surrender the healing machine. Dr. Rosen left the station and gave the device to Dr. Franklin.
At the end of the Earth Alliance Civil War in 2261, Marcus Cole discovered the existence of the device and used it on himself and the mortally wounded Susan Ivanova. Franklin found out that Marcus was going to use the device but it was too late. Marcus was dead and Susan was alive and physically well.
By 2560, an expedition to the Rim discovered the ruins of the alien civilization that had produced the Energy Transfer Device. The ancient documents and records found yielded information that allowed for the revival of Marcus Cole, who's body had been kept intact in cryonic suspension on Minbar since the decommissioning of Babylon 5.