Super Smash Bros. has long been well known for taking the iconic characters of Nintendo franchises and having them duke it out on classic battlefields and stages from multiple games - but what if it were the favorite characters and places from the games of Valve, instead?

A new fan-made video by YouTube user CrazyHalo, "Super Smash Bros. Source," takes that idea and runs with it - to an amazing degree, in fact. Taking the original intro movie from Super Smash Bros. Melee and recreating it virtually frame by frame, the video replaces Nintendo characters with memorable faces from a variety of Valve's franchises, including Half-LifeLeft 4 DeadPortalTeam Fortress 2, Dota 2, and a few other surprises thrown in as well.

You can check out the full "Super Smash Bros. Source" video below, and start envisioning your ultimate match-ups between Gordon Freeman and The Heavy now: