Very-very few. Aside from Back to the Future there is the less known: Crime of the Future, and some straight-to-video movies.
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Thanos is a Marvel character. He first appeared in a Marvel comic in 1973 and has since become a prominent villain in various Marvel comics, movies, and TV shows.
Although it had some crossover to "teen movies", the film "Back to the Future" (1985) and its sequels were family-oriented science fiction movies.
Stan Lee cameo's in all Marvel Movies. In Spider-Man he is mistaken for Hugh Hefner. In The other Movies I don't know when or where he appears. But he's in them all.
Yes, All of them are
Wolverin's wife Viper will apear in the next X Men series of the Marvel Movies but due to copiright issue she will not be named with Hydra in the film.
It's a Wrap - 2012 Fox Marvel Movies 2-3 was released on: USA: 15 January 2013
The Marvel Cinematic Universe features a wide range of characters, including superheroes, villains, and supporting characters. As of now, there are hundreds of characters introduced in the Marvel movies, with more being added with each new installment.
The Incredible Hulk to Iron Man 3.
Marvel comics that are converted into movies have been doing quite well financially, so for profit would be the number one answer. Also, several movies are being made from other character, such as Captain America, to get the general public familiar with some Marvel history before starting The Avengers series of movies, which many of these characters will be starring in.
Not at the moment, they don't. Maybe some time in the future they could have people watch movies for money.