Director/star Clint Eastwood's "Sudden Impact" is an intriguing addition to the "Dirty Harry" series - a combination of crude film-making and genius. It's mediocre and silly in parts, brilliant and classic in others, with compelling, gripping pacing. There are numerous echoes of the first film here - the shoot 'em up "Make my day" scene recalls the "Do you feel lucky" one, one of the villains is as viscerally repugnant as the first film's Scorpio, an actor who played a minor baddie in the first one returns here as Harry's partner - just to name a few.
Harry Callahan is still at odds with the higher-ups in the department, still mean, still tough, but now he's older and wearier. His constant conflicts with his superiors are a metaphor for his inner conflict - a respect and reverence for the law versus a desire to serve the pure spirit of justice, the two things not always being compatible. This "incompatibility" is the underlying theme of the series. The first film posed a simple question, "What about the victim's rights?" - (do they outweigh those of the criminal? Vice versa? Depends?). That film's answer was controversial, prompting a sequel (the highly enjoyable "Magnum Force") which set out to draw the line between Harry's brand of justice and pure, heartless vigilantism. Dirty Harry, like many of Clint's other roles, is the personification of vengeance, the protector of the the defenseless. This movie however brings it back to the victim, in this case Jennifer (portrayed by Sondra Locke), who decides to avenge the rape of herself and her now-incapacitated sister by ruthlessly hunting down and ritualistically executing the men (and one woman) who committed the crime.
Without going into a play-by-play of the whole movie, I will say this - I mentioned earlier that "Sudden Impact" echoes the first film - it actually also sprinkles in little references and in-jokes from the whole series (the confusion concerning the captain's last name is an example - an intentional prank, I believe). The relationship between Callahan and Jennifer is neat - has our rogue cop hero found a soul-mate in this lady vigilante? And is she a vigilante or a victim justifiably standing up for her and her sister's tarnished rights? The exchange between these two at the very end of the film is a poetic denouement of the series, one which I personally (as a fan) found quite moving. That last scene alone makes Sudden Impact the legitimate climax to the "Dirty Harry" collection, the perfect answer to the conflict posed in the first film. (Not to knock "The Dead Pool" - that excellent movie was a relatively light-hearted suspenseful yet comic thriller featuring Harry Callahan, rather than a character-defining film like this one).
This movie did well in the theaters - audiences in the Reagan Era found Harry and his ilk quite appealing, and the President himself frequently quoted "Go ahead, make my day."

I saw this movie on mystery science theater when it was called "It lives by night". That title is much less misleading than "Batpeople". In fact it would more accurately be called Batperson. This movie is about a doctor who studies bats I am thinking because he wants to make a better cure for rabies. This is not really clear. What is clear is that he and his wife take a tour of a cave and he gets bitten by a bat. Why a scientist needs to take a tour to study bats is beyond me. Shouldn't he be able to go in by himself. Well after being bitten he and his wife go on their honeymoon where he starts having fits. They go to the worst doctor ever. The guy stays in the hospital and kills a nurse. In the end the guy kills 3-4 people and his wife stands by him and you are supposed to be rooting for him instead of the sheriff investigating the murders.