In its sequel , Half-Life 2 , Gordon is introduced to a dystopian world years after the Black Mesa incident , along with an interdimensional alien overlord force known as the Combine , which took advantage of the interdimensional portals and has established itself as the ruling force on Earth .
In the second game , Half-Life 2 , Gordon is introduced to a military world years after the Black Mesa incident , along with a force known as the Combine that took over the world .