Philadelphia Experiment II (also known as The Philadelphia Experiment II, The Philadelphia Experiment 2, or Philadelphia Experiment 2) is a 1993 science fiction film. It is the sequel to the 1984 film The Philadelphia Experiment, but has none of the same cast or crew and only two of the same characters. It stars Brad Johnson as David Herdeg (the hero from the first film) and Gerrit Graham as the villain who meets an untimely end.