“The timeline skewed into this tangent…” Back to the Future Part II is a spectacular mess. Its ambition gets ahead of itself, resulting in a disjointed and convoluted film that, while entertaining, isn’t very cohesive. While Marty and Doc are visiting the future Biff steals the time machine and alters the past, forcing Marty and Doc to go back to 1955 and undo the damage to the timeline. The first half of the film is a train wreck, but the second half (when they return to 1955) is brilliant. The writing is especially clever in the way it interweavers the story through the first film and expands upon it. And the cliffhanger ending is outstanding, acting like a shot of adrenaline that revs up the energy of film to end on a thrilling climax. Despite the clunkiness and plot issues in the first half, Back to the Future Part II manages to deliver a fun and exciting adventure.