Avengers

Avengers

Development: 

The idea of the film came from the marvel comics
Marvel studios agreed to make the film

Avi Arad owns marvel studios and the budget for the film was £220 million and the film  produced by Kevin Feige 

Pre Production:

The script was written by Zak Penn and Joss Whedon.

The film was also directed by Joss Whedon.

The people who stared in the film where;

Robert Downey,Jr.

Chris Evans

Mark Ruffalo

Chris Hemsworth

Scarlett Johanson 

Jeremy Rennerbigigitututut

Tom Hiddleston

Clark Gregg

Cobie Smulders 

Stellan Skarsgard

Samuel L. Jackson  

The film was filmed in the USA. And the Filming locations were;  

Parma, Ohio 

Public Square Cleveland  

Wright pattersons air force base, Ohio 

Cincinnati, Ohio
East 9th street, Cleveland
Plum brook station, Sandusky 
Albuquerque studios
Wilmington, Ohio 
Lake side court house, Cleveland 
New Mexico 
Ameritrust, Cleveland 
Cedar Avenue and Ashland road, Cleveland 

NASA glan centre 
Los Angles, California
Pittsburg Pennsylvania
Raleigh Manhattan studios
Grumman aerospace centre, New york 
New york city centre. 

Production:

The filming for the mvid began on April 25th and finished on August 28th

There were a few different cameras used to shoot the film these include the canon EOS 5D mark 2 and the Cannon EOS 7D SLR. some of that shots there were high speed were shot with the arrifflex 435. 

Post Production:

 The film was edited by Jeffery Ford and Lisa Lassek.

In the UK the film was released on the 26th April and in the us the film was released on May the 4th 2011.   

All together there were 2200 special effects used in the film. A company called ILM were involved and did many of the special effects. 

One review said "The avengers have been assemble and, for the most part, they fit together superbly. A joyous blend of heroism and humour that raises the stakes even as it maintains a firm grip on what makes there individual heroes tick." http://www.empireonline.com/reviews/reviewcomplete.asp?FID=136194
The Guardian said that "For me, no superhero crew with out Kick-Ass's Hit girl could ever be truly awesome, but this one i.e. registering strongly on the awesome-o-meter nonetheless. Its an enjoyable absurd and absurdly enjoyable extravaganza, both delirious and surrealist. 
http://www.theguardian.com/film/2012/apr/26/avengers-assemble-review 
Another review said "with great power comes great banter in writer/director Joss Whendon's blockbuster multiplier, which isn't the best superhero movie ever - but might well be the funniest"
http://www.totalfilm.com/reviews/cinema/the-avengers-assemble 
IGN said "We can all rest. They pulled it off! Marvels The Avengers is everything we've been hoping for an exiting superhero team-up film packed with memorable moments. 
http://uk.ign.com/articles/2012/04/27/the-avengers-review
Another review said "The Avengers has it all. And then some. Six superheroes for the price of one ticket: Iron Man, Thor, Captain America, Hawkeye, Black Widow and the Hulk. It's also the blockbuster I saw in my head when I imagined a movie that brought together the idols of the Marvel world in one shiny, stupendously exciting package. It's Transformers with a brain, a heart and a working sense of humor. Suck on that, Michael Bay."
http://www.rollingstone.com/movies/reviews/the-avengers-20120430
There were a few different marketing campaigns involved in the avengers, one was that all the marvel films leading up to the avengers were building up to it and acted as trailers for the film. 

Another one was that there were different teasers and trailers being released up to the released date. Also there was a big premier for the film that built up a status for the film.  
The Film at US box office made $200.3 million and in the UK it made $25.5 million and overall now has made 641.8 million world wide.The film was released on DVD and blu-ray on the 25th september 2012.