So, um, how to explain the video concept here? Well, it starts off with a bunch of damn dirty apes--scientist apes, of course--playing a gruesome game of Operation on some sort of lobster/cow monster hybrid.
Then the lobster-cow-man, whose name is apparently "Smith," comes to life, Frankenstein-stylee...and goes to college, marries a cute coed, sires a lobster-cow-baby, climbs up the corporate ladder, runs for public office, becomes a mad (cow) dictator, brainwashes all of America, starts World War III, and ultimately puts the scientist apes (who've been manipulating him via a remote control all along) in charge of Planet Earth.
So yeah, just your typical, everyday music video.
This must've looked great on paper when the director came up with the treatment. How could Bloc Party say no to such a concept? And it's a good thing they didn't, because basically, "Mercury" is the coolest science-vs.-monkey music video since Basement Jaxx's "Where's Your Head At"; it features the best utlilization of costumed cows since Alcazar's "Crying At The Discoteque"; it includes (WARNING TO SQUEAMISH VIEWERS) the most gratuitous use of far-flung, bloodied internal organs since Robbie Williams' "Rock DJ"; and most importantly, it's probably THE greatest unofficial chapter in the Planet Of The Apes saga.