Watch KNUCKLEHEADS for Free: How to Stream the Movie Online at 123Movies. . After a Kevin (Benjamin Price) moves into the block he meets two friends. Danny (Wesley Clark) and Jackson (Hunter Haubert) who join with Kevin to make a small business, making the bullies afraid of the nerds. After Danny disappears, Kevin and a small group of friends join together to face off the big bully Marlin (Ethan G. Jocis) to recover there close friend.