The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- 1st Officers (2 members)
- 30 Minutes After Noon (24 members)
- 70-B-Lo (11 members)
- A Bad Name (1 member)
- A Case for the Bishop (26 members)
- A Christmas Miracle (11 members)
- A Christmas To Remember (8 members)
- A Close Shave (1 member)
- A Cure for Everything (1 member)
- A Day In The Life Of A Space General (10 members)
- A Lawman Rides Alone (1 member)
- A Little Art (10 members)
- A Little Bit of Luck (1 member)
- A Nut For Marineville (9 members)
- A Question of Miracles (31 members)
- A Question of Priorities (17 members)
- Acronyms (4 members)
- Actors (11 members)
- Administrators (1 member)
- Aeronauts (2 members)
- Aircraft (15 members)
- Airline Pilots (12 members)
- Airliners (2 members)
- Airports (2 members)
- Alias Mr. Hackenbacker (25 members)
- Alien species (21 members)
- Amazonian Adventure (10 members)
- Ambush (1 member)
- An Echo Of Danger (11 members)
- Anderson Specific Lexicon (1 member)
- Angel Interceptors (1 member)
- Anime Television Series (1 member)
- Aquanaut of the Year (9 members)
- Aquanauts (31 members)
- Arctic Adventure (6 members)
- Art Directors (1 member)
- Article Stubs (143 members)
- Article management templates (2 members)
- Article stubs (0 members)
- Assistant Art Directors (1 member)
- Assistant Directors (8 members)
- Assistant Editors (1 member)
- Associate Producers (1 member)
- Astronauts (59 members)
- Atlantic Inferno (31 members)
- Atomic Witch Hunt (11 members)
- Attack Of The Alligators! (18 members)
- Attack Of The Tiger (1 member)
- Attack On Cloudbase (18 members)