It's Mann vs. monsters in this Binding of Isaac themed TF2 map
Team Fortress 2 is no stranger to crazy boss fights, but a Nolan North-voiced bomb spamming wizard is one thing, a floating skeletal head that shoots ubercharged spies is quite another. That's what you'll face in this insane TF2 community map, highlighted by Isaac creator Ed McMillen on his blog.
The map contains multiple levels and bosses from the game, and uses Blu team mercenaries in place of Isaac's varied cast of monsters. The video shows fights against Husk, Mom and Mom's Heart, as well as a representation of the Wrath of the Lamb expansion's super-final boss fight.
To play it you need to visit the Super Zombie Fortress server of the map's makers, the unfortunately named SLAG gaming. Annoyingly it's in rotation with the server's other SZF custom maps, meaning there's no guaranteed way to ensure a game. But you can still enjoy the absurdity of this boss fight round-up video.