hl2:kk you at the train and you just arrived at city 17, you met barney but you have to get away,then the civil protection begins to atack you,you find alyx and arrive at doctor kleiners lab then after you done all that shit you arrive at eli's lab then you get the great,the super the asskicker gravity gun then the combine arrive and you get separated from alyx then...
...you got to get to the zombie city (know as ravenholm) them you met the father grigori (crazy by know) then after you throw all that shity shotgun bullets at the zombies "faces of ass"you get out of that fucking town and then again the mega shit combine wants to eat yor ass again make then eat your dick=: ). then you discuver that alyx father has been captured and hes been taken to nova prospekt then you met the great,the supers,the megas the asskickers