The MIR Space Station was the world's first modular space station. It had been ran by Russia (with it being developed under the Soviet Union). It was featured in the Season One episode, "Pinkeye". With it later being deorbited during 2001 because of the station aging with the ISS being semi-operational by this point.
One of the astronauts in the MIR Space Station was checking the propulsion systems when a second astronaut scared him, as it was Halloween. After the first called the second a communist bastard, there was an error aboard the station and it crashed into Earth, killing Kenny.