Like many of the other reviewers, I remembered bits and pieces of this film from my adolescent years(ok maybe 11-13). I finally tracked down a copy and the film came back to me as I watched it. The guinea pig killed with broken glass and squealing, the English teacher with the paper cutter, the merciless jocks, and so on rushed to my brain and brought back that late evening in the 70s when I saw this film for the first time. The film is by no means great or even good, yet something in it makes it so memorable to those of us writing here. I am not sure what that quality is - maybe we see ourselves in this protagonist in small pieces. I don't want to get too psychological here, but it must be something about the film. The film is about a young man picked on by all who loves biology and the experiments he has been working on all summer. Everyone at this school..and I mean everyone except a young girl that admires the young man for his intellect...is cruel, sadistic, and totally uncharacteristic of what you would find in teachers and the like. He experiences one shocking mistreatment after another, until forced to drink a serum he has been working on, becomes a Hyde-like character that avenges himself for all the wrongs redressed towards him by all his enemies. The film is very cheaply made...very dark in most places, and it is very gory for its time, which also might explain why it is memorable. I liked the film, defects notwithstanding.