|Birth Name||James Lyman|
|Role||Member of the New Caprica Police|
|Rank||Specialist (Colonial Fleet), Captain (NCP)|
|Portrayed by||Dominic Zamprogna|
|James Lyman is a Cylon|
|James Lyman is a Final Five Cylon|
|James Lyman is a Human/Cylon Hybrid|
|James Lyman is an Original Series Cylon|
|James Lyman in the separate continuity|
|James Lyman in the primary continuity|
James "Jammer" Lyman is a member of the New Caprica Police who was formerly a deckhand assigned to Deck Crew 5 under Chief Tyrol. While on Galactica he was often seen working alongside other crewmembers Socinus and Cally in the hangar bay.
When President Roslin makes it public knowledge that Cylons are now capable of mimicking human form, paranoia spreads throughout the Colonial Fleet. Cally and Socinus argue with Lyman that everyone shouldn't become suspicious and stop trusting one another or the Cylons get what they want. Lyman tells his shipmates that the time for that kind of thinking is in the past and it's "every man for himself now" (Litmus).
Lyman also scoffs Tyrol's attempt at constructing the Blackbird, though he later reconsiders his decision and aids the deck crew and Tyrol in finishing the prototype, which he signs the hull of using his nickname (Flight of the Phoenix).
As with most of the Fleet, Lyman settles on New Caprica. After the Cylons occupy the planet, Lyman becomes a member of the New Caprica Resistance. He appears to very religious, and objects to hiding weapons in the temple. Lyman is picked up by the Cylon authorities and asked about the events of the temple by a copy of Number Five. He later joined the New Caprica Police (The Resistance).
Jammer survived the suicide bombing carried out by Duck at the NCP graduation ceremony and later participated in the rounding up of "insurgents" ordered by the Cylons. Like all NCP personnel, he wore a mask to conceal his identity, and not even Tyrol was aware of Jammer's new position. Jammer had a slight change of heart when the Cylons ordered the execution of 200 detainees, including Cally. At the execution site, just before the firing squad of Centurions appeared, he cut Cally's bonds and told her to run. The Centurions were then fired on by Tyrol and his fellow insurgents, who rescued the detainees.
Jammer somehow escaped capture or shooting by Tyrol's squad, and was seen again as New Caprica City was being evacuated during the Battle of New Caprica (Exodus, Part II). Tom Zarek gave him a sidearm and told him to guard Laura Roslin as she made her way back to Colonial One. Jammer was on board the Presidential liner when it took off to rendezvous with the Fleet.
- It has been speculated that Lyman may be one of the remaining humanoid Cylon models to be revealed.
- For some time, it was not entirely clear whether "Jammer" is the character's actual name or his nickname (like Tyrol being called "Chief" most of the time in casual conversation) because no one ever formally addressed him by name and rank, i.e. "Specialist Jammer" was never been spoken aloud. Curiously, he signed his name on the Blackbird simply as "Jammer".
- Lyman is distinct amongst the deck crew of Galactica in that while essentially all of the other deck crew characters so far shown wear orange jumpsuits, Lyman's jumpsuit is yellow (this makes him easy to spot for fans who might not know who he is). This is probably done to add to the realism of the Re-imagined Series, because real-world aircraft carrier deck crew personnel wear color-coded jumpsuits according to their assigned tasks. On real-world US Navy carriers, yellow-suited deck crewmen are charged with aircraft handling, catapult gear, and plane direction duties. The US Navy actually doesn't use an orange-suit designation, but the closest to that are red-suited personel, who are charged with ordnance, crash and salvage duties.