How would you deal with the second phase of marvel's cinematic universe? At the end of avengers, we saw Thanos so it is likely that he is the villain the the next movie. Here's how I would write the movies if I could.
Iron Man 3 (May 2013)
It has been revealed that Iron Man 3 will take place in China, so it will likely have the Mandarin as a villain. I would have this version of the Mandarin be VERY different from the comic books, just to make him more modern. He will be a warlord, who is in a South-East Asian territory dispute with the secretly resurfaced HYDRA (who will only be vaguely alluded to in the film). The Mandarin and HYDRA are in a race to find the 4 infinity gems that arrived in South Asia when the tesseract went insane. This justifies Thanos' (who will also be vaguely alluded to) interest in Earth. The Mandarin and HYDRA both want the gems for different reasons. The Mandarin worships death, and plans to sacrifice the gems to Thanos. Tony Stark is on a buisiness trip in Asia, and the story writes itself from there. At the climax, The Mandarin is defeated, but sends the purple gem of space to his "master". The After credits scene: Thanos sets his sights for Asgard. There is also a Luke Cage cameo, in which Iron Man interrupts a Beijing arms dealer meeting, and must deal with a young Luke Cage (not-yet powered)
Thor 2 (November 2013)
Asgard is under constant attack, after the nine realms erupted into a revolution, following the destruction of the Bifrost. A reluctant, travel guide Loki, and Thor must travel across the now hostile plains of existence to track down the stolen Infinity Gauntlet, which was taken from the Asgardian hall of weapons, along with the gems of Power, Mind, and Reality that were with it, with Sif and the Warriors Three. Eventually, they must gather an army to battle the mind-controlled Surtur, but cannot restore the gauntlet. Enchantress is the villain who has betrayed Asgard for Thanos.
Captain America 2 (April 2014)
HYDRA has occupied a vast amount of the middle east in search of it's almost 7 year-long search for the gem of time, which they plan to use to help their world conquest. In London, they ransack the apartment, of "asset" Pietro Maximoff. He escapes in an instant using his super speed, but his four yr old sister, Wanda is taken. Baron Zemo, disfigured head of HYDRA, threatens to kill her unless Pietro deals agrees to be part of the Masters, a group of mercenaries that will deal with any problems Zemo might have. After the gem of time causes a massive incident, involving creatures from the past to emerge in a HYDRA-occupied middle eastern city, Cap and SHEILD are sent to intervene. The incident is revealed to be a trap, and Zemo sends the Mercenaries to crash the retreating helicarrier. Pietro schools Cap. The helicarrier, with Cap on it, crashed in the Desert. Zemo has his science division find a way to go back in time to save the Red Skull, but it will take a lot of time. Cap, and the surviving SHEILD agents journey through the desert, which is full of the nastiest creatures that Zemo can find in the time-space continuum. Meanwhile, in HYDRA's middle eastern capital, Wanda is shot after exhibiting mutant powers of her own, and one of her projection vaguely resembles Magneto. Wanda dies, and Pietro engages Zemo, causing Pietro to be thrown off of a tower. He survives, and is taken in by an underground resistance force, with a gem of their own, that has been part of their cultue for generations. Using the soul gem, they find Captain America, raid a HYDRA convoy, smuggle Cap and the SHEILD agents into the city, and stage a riot. Which results in HYDRA losing any ground in the middle east. Zemo is killed, but first launches both gems into the time space continuum. Pietro, now using the codename Quicksliver, joins the Avengers. After credits: Thanos finds the remaining two gems, and prepares to attack, Earth, and whatever other planets he has not reached yet.
I know some of them are pretty bad.