Black Widow infiltrates a terrorist
group called L.U.N.A.R. (Life Under Natural Authoritarian Rule) and
makes off with a box. She then meets with Captain America, Black Panther (T'Challa), and the Falcon, telling them about L.U.N.A.R., a group bent
on world domination led by a fanatical woman named Irma Krakov. They
have a Vibranium-powered superweapon, but that's not the worst part:
the box Natasha stole from them contains a fragment of the Cosmic
Cube. And they already have a Cube fragment so they will likely move
up their timetable....
From their base on the Moon, Madame
Krakov orders a test for their Cosmic Cannon by shooting down a
Helicarrier on Earth. But the Avengers arrive, infiltrating the base
and fighting their way through autonomous weapons and living guards
to reach the main chamber. As the Cannon recharges, Black Widow goes
toe-to-toe with Krakov, beating her up while they debate philosophy;
Cap defeats super-henchman Klove, likewise while talking about ideals
and weaknesses and the like. The Cosmic Cannon gets ready to fire so
Black Panther puts his Vibranium gauntlets onto the Cosmic Cube
shard, causing a dangerous overload. The Avengers quickly return to
the Quinjet while the L.U.N.A.R. moon base blows up, as most of the
baddies also escape in time.