With the portal open and the aliens invading at will, the action gets under way and is spectacular in every way.
The 3D action is not gratuitous, it is just like we have a spectacular window into one hell of a battle.
But our superheroes are determined to save the world and their individual skills, and eventual teamwork, create plenty of havoc for the invaders.
The two things that stand out in The Avengers and put it a cut above its cinematic predecessors are the action and the humour.
At times, when the chips are down and all is almost lost, humour regularly pops out in a clever and most welcome way.
And the action is top rate as the city of Manhattan suffers a serious pounding under enemy attack - not to mention the damage done when the Incredible Hulk loses his infamous temper.
Strap yourself in for a great ride.
The Avengers 3D
(M), 150 minutes
Rating: 4 / 5 stars