 Creating the CGI Hulk was the most complex task ever undertaken by  ILM to date. Actually there are not just 1 but 3 distinct Hulks in  the movie. As Hulk gets angrier he gets bigger. The first (angry)  Hulk is 9 feet tall, the second (angrier) Hulk is 12 feet and the  third (angriest) Hulk is 15 feet tall. Moreover they also had to  make him move at a top speed of 300 mph and be able to leap 3