Episode 1: Though the Backdoor
When Major Dussomb takes over the senate, he declares Gui Montage and Butch Masonry rebels. The two men must fight their way across space first to join up, and then to escape before Delta Force destroys them.
Eventually a series of Five, these are two-player co-operative episodes. So find a willing partner and dig in. Be warned, though, these are very tough levels.
NOTE: These scenarios should be started in Broodwar mode, not regular Starcraft mode.
Episode 2: The Isle of Spite
Reserves all but spent, Gui Montage brings his men to a Zerg-infested planet in an effort to mine needed resources. Zerg forces are incredibly strong, but Gui finds an unexpected ally in Narkkos, from the Protoss Alliance Forces. Now if they can just get the job done before Delta Force catches up with them.