Now a fugitive from the United States, Banner worked in a soft drink bottling factory in Brazil while attempting to find a cure for his condition with the help of an Internet friend known to him as "Mr. To prevent another transformation, Banner underwent rigorous meditation to control his emotions and keep his pulse at a steady level. Blue" requested that Banner send him a sample of blood, which through some tests revealed a potential cure.
However, Blue needed the data that changed him first in the first place.
Banner's personality is that of a kind doctor who likes meeting new people, such as Tony Stark and Steve Rogers, although he is not without a sarcastic side.
Upon creating a feasible sample, Banner was so sure of himself that he exposed himself to gamma radiation to test the recreated serum, but the experiment transformed him into the Hulk.
The Hulk demolished the lab, grievously injuring his girlfriend Betty and forcing him on the run.
Banner wakes up in Guatemala, dazed by the experience and eventually makes his way to Culver University in the United States, where a now-recovered Betty was dating psychologist Doctor Leonard Samson.
Unable to access his old lab to retrieve the data, he sees his old friend Stanley, a pizzeria owner, for a place to stay and a job as a delivery boy.