Watching Avengers 2 I kinda wish they would've had another movie bridging Iron Man 3 to Ultron. Specifically a Hulk movie with Tony Stark as a side character.
The story would be about Bruce Banner doing his research at the Avengers training base we see at the end of AoU. Tony helped Bruce set up the base as a place where Bruce can feel safe isolated from the general population. It also has a Hulk safe room burred 300 meters underground for Bruce to work on his control.
The timeline would take place just after the events of The Winter Soldier and with SHIELD no longer able to protect Banner from the military General Talbot forms a task force to take Bruce into custody.
While the military attempts to fight through all of Tony's non-lethal security measures and apprehend Banner at Stark's facility Bruce isolates himself in the Hulk safe room which the military unwisely hacks open unleashing the Hulk.
The Hulk escapes and lands in a rural town several miles away where the terrified local law enforcement attacks him. Still raging from the fight with the military at the base the Hulk begins to attack the town destroying buildings and vehicles. After a tragically long rampage the Hulk calms down enough to realize there's no real threat and that everyone's afraid of him. He disappears into the woods.
Meanwhile in NYC defense attorney Jennifer Walters is contacted by Tony Stark. Tony knows of Jennifer through Bruce, her cousin. He wants Jennifer to accompany him to the rural forest town Bruce was last seen in to help track him down and bring him in before the military gets him.
Back in the town the military has moved in and instigated Martial Law under command of General Talbot. Talbot has convinced his superiors to let him deploy the Hulkbusters, an elite crew of special forces using 20 foot tall mechanized tank suits reverse engineered from Ivan Vanko's few remaining drone plans that weren't destroyed in Iron Man 2 (they were seized by the government after the events).
The locals complain that Talbot is more interested in fighting the Hulk than repairing their town. Talbot publicly reassures them that the military is there to help, but secretly he is acting under orders by an unknown non-military superior.
Back in the forest the Hulk has fallen asleep by a riverbed and awakened as Banner. He hits the road and is picked up by Tony Stark who's tracked him down using the same method of tracking gamma radiation Banner developed in the first Avengers to find Loki's scepter.
Tony takes Bruce back to a remote cabin he purchased on the way up there where Jennifer is waiting for them. They discuss Bruce's legal options and decide it would be best for him to turn himself into the local law rather than the military.
Talbot has found out about Tony and Jennifer being in the area and comes by the cabin to search it for Banner. Jennifer, however, reminds him that he needs a warrant and probable cause to enter and helps hide Bruce. Despite their efforts Talbot spots a pair of torn up purple pants in his brief glimpse through the doorway and knows what they're up to.
That night in the town what many believe to be The Hulk, goes on another rampage, this time destroying a school full of civilians leaving many injured.
The next day Talbot and his Hulkbusters have been granted the authority to raid Tony's cabin and begin assaulting it. Bruce refuses to change at the risk of putting people in danger again and they attempt to flee instead. During the escape though Jennifer is badly hurt by the Hulkbusters and Bruce once again turns. However, this Hulk is no match for the largest of the Hulkbusters who nearly captures him. Tony, however, is able to hack the larger Hulkbusters armor momentarily disabling it to give the exhausted Hulk, who is slowly turning back into Bruce, a chance to escape with him and Jennifer.
Tony and Bruce make it out with Jennifer and find the local hospital. The staff believes they're victims of the Hulk's attack on the school and takes them in. Bruce agrees to help the small medical staff handle all the wounded caused by both Hulk attacks.
The doctors can treat Jennifer's injuries but without a blood transfusion she'll die. Bruce, being a close relative, is the only one compatible with her blood type. He reluctantly outs himself as the Hulk to the locals in order to warn them of the consequences of giving Jennifer his blood. The few townspeople who learn this forgive Bruce since he has helped them more than Talbot has.
However, one of the locals, who still resents Bruce from what the Hulk did to his town, snitches their location to the military. Talbot once again arrives with his Hulkbusters to capture Bruce, but through the transfusion of Bruce's gamma irradiated blood Jennifer has become She-Hulk.
Though not as strong as the Hulk, She-Hulk is still immensely powerful and still retains her mind as Jennifer, although now she is far less inhibited in this body than she ever was in Jennifer's.
As She-Hulk Jennifer is also able to help guide Bruce as the Hulk away from the town and they both head into the mountains to lead the Hulkbusters away from the civilian population.
From there it's a HUGE battle between She-Hulk, the Hulk, and the Hulkbusters led by Talbot and the large Hulkbuster at the top of a mountain range. During the fighting each Hulkbuster is dismantled one by one with She-Hulk and Hulk removing the pilots from their controls. However, the largest and toughest Hulkbuster is revealed to actually be an Armored Abomination who has been secretly working with Talbot to frame the Hulk for the attack on the school.
Back in the town Tony has sent for his new unarmed robotic drones, dubbed "Rescue" to aid the town in restoring its infrastructure. Jennifer as She-Hulk returns with Bruce who turns himself into the local authoritative to await trial.
At the trial in the town square Bruce is found guilty of destroying the town as The Hulk including injuring law enforcement and civilians. Bruce, however, has won the sympathy of the town and is given a sentence of community service to be preformed at the local hospital.
Talbot has convinced the press that he was given the Hulkbusters by Hydra posing as SHIELD in a conspiracy to frame him and that he had no idea he was working with The Abomination. Under scrutiny from the press he withdraws his forces from the town and agrees to let Banner serve his community service and is told that any further attempts by the military to wrongfully imprison Banner will have to go through his Lawyer Jennifer She-Hulk Walters. Talbot leaves defeated but not without issuing a final report to his unknown superior he only addresses as The Leader.
Tony, Jennifer, and Bruce gather at Tony's luxuriously remodeled cabin. Tony reveals to Jennifer that he's been on a bit of a break with Pepper ever since the events of Iron Man 3 and that this vacation was a good way for him to get his head straight and start thinking about the future. Jennifer, who's previously been shy around Tony, transforms into She-Hulk and kisses him, then tells him to shut up, takes him in her arms, and carries him to the bedroom.
Bruce excuses himself and says he's going to take a walk. As Tony lets loose with yells of confused yet altogether pleasurable yelps a full moon rises over the mountainside where The Hulk leaps onto a peak and roars into the night sky.
Roll credits.
Post credits scene: Steve Rodgers rides up on his bike and knocks on Tony's cabin door saying he needs Stark's help to hunt down Hydra. Stark answers draped in bedsheets looking shell shocked and tells Steve he'll get his pants.