Space Channel 5 is a Dreamcast (and PS2) rhythm action game that had you controlling a sassy reporter through a series of dance-offs. It has absolutely nothing to do with multiplayer shooter Team Fortress 2. Until now.
Using the magic of the personal computer, YouTube user xcloudx01 has put together this clip in which Space Channel 5 (which if you're not familiar with you can see below) is played not by Ulala and Michael Jackson, but by... some guys from Team Fortress 2. And Grand Theft Auto IV's Nico. And a Pyramid Head from Silent Hill. And... Daft Punk.
It makes no sense, but then, as xcloudx01 points out, the backup dancers you had in the original made no sense either, so it's totally cool!