God intervines and switches Gordon Freeman with Master Chief. Master Chief must survive all the shit that happened in Half Life 2, E1, and E2. He gets all the HL2 guns and veichles, BUT!!!
He can carry 8 grenades, just like in Halo, and he doesn’t use the crowbar, just pistol whipping.
Other than that, he uses the guns in the exact same way. Think he can do it?
Also, MC can heal from wall mounted health units like gordon, And the wall mounted combine suit energy thingies can power his shield like a regenerator.
Master Chief will progress through all the same areas,meeting the same people, experiencing the same story, and fighting the same monsters with the same guns as gordon uses, accumulating them at the same rate.
So MC gradually accumulates: a 9x19mm USP Match pistol with 18 round clip and 150 rounds reserve, a HK MP7 with 45 round clip and 225 rounds reserve and M203 with 3 nades, A .357 Magnum with 6 rounds chambered and 12 rounds reserve, a Franci SPAS- 12 double barrel shotgun with 6 shells chambered and 30 shells reserve (capable of double shot), 8 Hi- explosive grenades, an AR2 Combine pulse rifle with 30 pulse charge and 2 extra charges with a 3 shot energy core launcher, a load of pheropods, and finally- A laser guided RPG with 3 Rocket propelled grenades. Phew.