>game starts in Antarctica
>you and alyx make your way to a mine, combine hideout
>gorgeous locations as you're killing enemies
>find a portal and jump in
>you are in aperture science and alyx is suddenly a teenager
>she's down bad for that mute freak gordon
>combine hunt you
>find another portal and go to ayy planet
>now gordon is a teen and alyx is an old hag
>ara ara, gordon
>they battle enemies on the planet, need a portal home
>find one and travel to abandoned black mesa
>gordon and alyx are normal again
>enter final boss