These fanfic episodes are an attempt to bridge the gap between the GTA games. I came up with the idea to cross over GTA with 24, although it does not have Jack Bauer kicking @$$ all over Liberty City, it simply borrows the Real-Time formula of 24. Each episode is an Hour, each season is a Day.
The main characters are Tommy Vercetti and Carl Johnson. They were both born on September 11, 1955, and met eachother at the age of 3. Over time the series deals with them helping eachother out, and also introduces later games' characters early on (i.e. Mike Toreno, Miguel). A brief description, indeed, but you can see what has been going on in the series so far, at:
Guru Games HQ
Or, look up GTA: TUS at:
Grand Theft Wiki