A remote Starfleet subspace relay staffed by a single officer, Barniss Frex, which tore itself apart when the Protostar's hidden weapon infected its systems.
Relay Station CR-721 is a Starfleet communications outpost at the far edge of Federation space. It appears in the Prodigy episode Asylum. Its only crew member is Lieutenant Barniss Frex, a fussy Denobulan who has been alone there for a long time.
The young crew of the Protostar dock at the station hoping to ask the Federation for refuge, and Frex begins processing them. When the Protostar links with the station, the living construct concealed aboard the ship activates, spreads into the station's computers and turns its systems against one another.
The station breaks up. The Protostar crew escape, now aware of what their ship carries, and Frex gets away in an escape pod. He is later picked up by Admiral Janeway's USS Dauntless.