"The game begins with the player's character driving through the Strangetown desert, presumably 'Road to Nowhere' in their car, when suddenly a flying green diamond (the marker and logo of the Sims game) flies towards the player and causes them to lose control and damage their car. Fortunately, the player finds a gas station. The player takes their car into the garage. At that point the player takes control. The player is introduced to a vehicle mechanic named Oscar who, after a brief tutorial in teaching the player how to talk to NPC Sims, informs the player their car will only take a short while to fix.
The player is then free to roam around the gas station, and after being introduced to some more NPCs, including Bella Goth, who claims to be abducted by aliens, completing tasks and being taught the basic objective of the game which is 'Secret Hunting' for the store clerk. The player then exits the shop only to find the garage around the back has completely disappeared along with Oscar and their car, with only the foundation of the garage remaining.
The player informs Police Deputy Duncan about the situation who replies that he can do nothing about it and suggests the player find a place to stay. After having bought Bella's house for pocket change and getting donuts for Deputy Duncan (which happen to have been found in the trash), the player finally gets a lift into Strangetown's Paradise Place, only to find more tasks and mysteries."
Source: Wikipedia, "The_Sims_2_(console_video_game)," available under the CC-BY-SA License.