The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Site maintenance (1 member)
- Songs (1 member)
- Space Rockers (7 members)
- Space Stations (1 member)
- Space Vampire (43 members)
- Special Formating Templates (3 members)
- Special effects templates (1 member)
- Species (6 members)
- Stub Templates (3 members)
- Subst Templates (1 member)
- TOS (2 members)
- TV series (1 member)
- Technology (26 members)
- Template using Master screencap (1 member)
- Templates (3 members)
- Templates using ParserFunctions (19 members)
- Templates using click (3 members)
- Terminology (5 members)
- Testimony of a Traitor (13 members)
- The Crystals (7 members)