Portal's plot is revealed to the player via audio messages or "announcements" from GLaDOS and visual elements inside rooms found in later levels. According to The Final Hours of Portal 2, the year is established to be "somewhere in 2010"—twelve years [...]
If this final chapter of the Half-Life 2 saga is ever released, it will continue the adventures of Gordon Freeman as he fights the trans-dimensional armies of the Combine in a valiant effort to end their occupation of Earth once and for all.
