Short of a playable demo, the best way to get a good overview of a game's features is an extended gameplay walkthrough, particularly if it's narrated by someone intimately familiar its mechanics --so much so, that it really should be a necessary marketing checkpoint for any upcoming title.

Today, we have one such video from Insomniac Games, with the Ratchet & Clank, and Resistance developer showing us the ins and outs of FUSE, the cooperative action game originally announced as Overstrike.

Here's a big update on Fuse for your viewing pleasure. We've got new story details and a reveal of our progression system. We also show off our Fusion mode along with some tips on how to use our Fuse-powered weapons for lethal teamwork. Finally, you'll learn more about LEAP, a feature that allows you to switch between agents at will during our story-driven campaign.

This is pre-alpha footage but we wanted to share it with you so you could see how the game is coming along. More to come!

The clip runs for 18 minutes, and is narrated by Insomniac head honcho Ted Price. Check it out below.

FUSE is due on PlayStation 3 and Xbox 360 in March 2013.