John is the SYNTH custodian of the USCSS Solara, a privately owned commercial ship. It is his duty to keep the ship and crew in stasis safe until they arrive at their destination. John is a very old synth, a spinoff of the David line, only a different appearance and slightly more advanced. He was a prototype that eclipsed David, but he was ultimately deemed far too "Human", much like his David series brothers. Though he may be old, his abilities are more advanced than even the somewhat new Bishop series. He sounds young, but has an old "soul".