Trekdom

She is so involved in Trekdom that she can pick up the phone just once and contact I don't how many meticulously organized Star Trek fandoms.

As is well known in Trekdom, the early Klingons were a thinly veiled metaphor for the Soviet Union.

She was cataloguing my collection of Trek zines because it contained items she hadn't heard of elsewhere, a real treasure trove of Trekdom.