“It is sometime after the events of HL2:EP2 (where have we heard that one before!?)
An early morning mission sees Gordon assaulting a facility overrun by zombies.
The Combine are thin on the ground, they are forced to leave some strategically important assets undefended.
Rebel intelligence has identified one such location, a Combine dark energy reactor retrofitted inside an abandoned Soviet missile base.
A crack team of Rebel special forces was sent in but are assumed dead because we have not heard back from them since.
Be careful, there is only one viable way in and out.
You are to go in, find access to the reactor, thought to be on the lowest levels of the facility and find a way to destroy it.
Intelligence suggests that a series of beams keep the spheres stable, so disabling these should eventually lead to a core meltdown.
Once you have disrupted the reactor, make it back to the extraction point.
We are counting on you, Doctor Freeman.”