Intolerable Threat is your fun and exciting, heart-pumpin, action packed HL/Op4 mission pack. Basically, Gordon has had enough of the G-man's evil antics over the years and its time he finally does something about it. Drilled into his brain is the G-man's evil face, torturing Gordon every day. There's only one thing to do and that is to assassinate the G-man to rid him once and for all. He'll encounter Barney and Otis along the way for assistance, but some of the Op4 grunts have grown tired of the G-man as well. Gordon is given the charge by the grunts to lead them out of the military base alive. Not all of the military are revolting though, don't forget about the Black-Ops and the loyal HL grunts, they are Gordon's enemy who are trying to hunt him down.

More battles, more puzzles and more Half Life/Op4 fun is what this mission pack is all about.

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