Escape from Earth
It's a shame the 2nd sequel "Escape from Earth" never got made. What would it have been about? and how would Snake leave Earth? Remember, at the end of the 1996 film, Snake used the doomsday device and shut down all the electricity and technology across the globe.
Escape from Earth could take place a couple of years after Escape from L.A. The powerless United States, along with the rest of the world has become a dump. The United States government has collapsed and ruthless violent gangs now rule the highways and the cities and they've returned lawlessness back to the American mainland. Snake Plissken is now a recluse in the west coast and has isolated himself from the world he destroyed and wants no part in the new world he made. An former member of the Black Light unit (Plissken's unit) manages to track Snake down and hires Snake for a job. Snake refuses, but later changes his mind. When he is told by the former Black Light unit member, about a maverick NASA scientist whom has been kidnapped by a violent gang and an EMP proof space shuttle, which the scientist had been working on and the gang kidnapped him, so he can lead them to the space shuttle. If Snake helps him rescue the scientist, he and Snake can get aboard the space shuttle and leave Earth and go to a colony on Mars.
Snake and the former Black Light unit member set off in pursuit of the gang, whom the scientist is leading them to the space shuttle, as the gang leader intends to get off Earth. Snake and the former Black Light unit member gain two allies: the leader of another gang. A former cop and his beautiful girlfriend.
The film ends with a showdown between Snake and the gang leader and the gang leader is killed by the scientist. And the scientist brings Snake to the space shuttle. Snake gets on-board the space shuttle and finds the space shuttle did not get shut down by the doomsday device and is operational. Snake abandons the scientist and the space shuttle lifts off and leaves Earth and Snake sets a course for the Mars colony. And it ends with Snake saying "Is there life on Mars?"