The X-Men were fighting against the Sentinels at their hideout. After fighting they are captured and then enconter the Master Mold, the Sentinel that can create more Sentinels.
The Master Mold use a machine to review Beast's memories and discover everythig about his past: he was a young boy that discovered his powers as a teen, and when on high school was a football star. When the people discovered that he had powers, they got angry on him. After professor Xavier had read about him in newspaper, he went to McCoy's house, talk to his parents and welcome him to the group he was starting, the X-Men. At this point, Xavier realizes Beast is talking to much about the X-Men and put him in a transe with his mental astral projection, but get almost killed in the process.
Dr. Bolivar Trask is still captive of his creations, the Sentinels.