Frequency is a movie that entertains, thrills, and stimulates, but all that can be ruined if you think too much about it. Dennis Quaid plays Frank Sullivan, a firefighter killed in a fire in 1969. Thirty years later, his son, John (played by James Caviezel), finds his father's old ham radio. Through the miracle of the Aurora Borealis (how many of THOSE do you see in New York?), they manage to talk to each other through the ages. Through this communication, John saves his father's life, but he changes history so that a famous murderer is back on the lam, and he is going to kill John's wife. So far, so good. But soon after, inconsistencies pop up. All in all however, this movie is a fine story that was short-changed in the theatres. I would recommend it to anybody who likes these kind of cross-time magical movies.