Tokyo is under siege… by worms. Seriously, worms and gargantuan bugs. Alpha-worms are parasites that burrow into people's heads and turn them into zombie-like carriers. Ken, an invincible ninja from America, is somehow immune to the worms and he's sent in as a one man army to save Tokyo before the worm infected denizens rule it. Ninja Blade's story is absolutely ridiculous. Almost as ridiculous as the action scenes where Ken surfs on missiles. Taken as an over-the-top B-action movie Ninja Blade is pretty funny.