Theloss (born reference stardate 1/92) was a Tellarite Starfleet ensign, serving in the navigation and sciences departments of the USS Arkadelphia on stardate 2/18, under the command of Captain Ian Vellacora.

During the maiden voyage of Arkadelphia, Captain Vellacora relieved another enlisted navigator, Dronn, after Dronn scuffled with Theloss in a fight over the affections of Ensign Freara. (FASA RPG module: Decision at Midnight)

In the game statistics provided for the non-player characters, Theloss had 35% as a numerical rating of loyalty to Captain Vellacora, making it likely a dice roll would side Theloss with mutineers and assist them in relieving the captain of command. At one point in the book, Theloss was referred to as a lieutenant junior grade, despite his dossier listing him as an ensign.
USS Arkadelphia personnel
UFP seal O. AdamsAlbersS. AllisonD. AlterS. ArnonW. BallardT. BartonB. BatesR. BrightonB. BrixtonBrr'ynnCandarT. CarmanV. CarnonP. CarterM. ChambersH. ChandlerU. CromwellR. DanielsR. DantonM. De LaFleurDronnB. DynessA. EllisonM. EllisonL. EvansV. EvansF. FellowsS. FlindersT. ForiniC. FowlerFrearaS. FreemanGallarE. GatesJ. GrenadineD. HannaR. HardiganC. HaromyL. HoganX. HorinB. LandarsV. LarsonV. LeeR. LoganC. LorinR. MajorsB. MartinC. MastersP. MatthwsB. MaximT. MillerD. MitchellT. MooreP. O'HarraT. O'ShanterR. OttersM.S. PaineH. PalomarW. PattersnA. PetersC. RavenY. RichardsT. RobinsonE. SantaraE. SimmonsE. SondermanS. StewartJ. TamaraM. TarackV. ThamesThantoraThantosThelossThoramJ. TompsonI.T. VellacoraM. WallaceI. WaltersC. WellsJ. WhiramE. WintersJ. Wintorm Starfleet Command logo
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