Half Life - Part 4: Wrong Way Down a One-Way Track

With the power restored, Gordon makes his way onto the old, decommissioned rail. His objective is simple - launch a satellite into orbit that will help the Lamda team with their research, then get out the other side. Easier said than done, however, with both the extra-dimensional beings and the angry military locking heads all over the place. Alone, with the weight of the world on his shoulders, Gordon carries on.