Suddenly Marc heard Mr. Thompson screaming. As he looked at him he saw his new left arm developing dark green scales. His left hand developed black claws. The scales spread over his body making him even more muscular. Thompson's screams changed into animalistic roars. Then his tailbone extended into a very long muscular tail ripping his jeans in the process. The tail grew longer than the rest of his body. Then Thompsons face reformed. His jaws extended and his teeth fell out. His hair fell out and scales replaced it. His face now looked more like the one of a crocodile. Then sharp dagger like fangs grew, giving him a deadly weapon. Then the scales reached his feet. His feet enlarged and pressed against his shoes. Then the shoes exploded off his feet and they grew into huge paws with four huge black claws. Then his leg muscles buffed once more. The literally inflated until they were twice the size of his arms and his biceps was bigger than a watermelon. His legs were thicker than big tree trunks. Then Thompson's whole body enlarged. He got taller and wider. He grew until he hit the ceiling. His head would be in the next room above them if he stood upright. He had to be more than 12ft tall. Then Thompson passed out because of the pain. While sleeping he grew a little more.
Matt had watched the whole transformation and now backed off the huge lizard in front of him. Then he realized that he got the serum too. He felt an immense pressure building up inside him.