For the first film, I was a little disappointed. Mostly because the plot was a bit out of whack, the characters were nothing like their cartoon counterparts and the ending revelations were silly. I found the second film on DVD and decided to buy it. I watched it and loved it.
The second film is a great deal better than the first film and more faithful to the cartoons, in fact, that's what it feels like - watching a feature length live-action episode of the show. The actors portrayals of Mystery Inc. have greatly improved and they seem more comfortable in their roles. The sets, stunts and special effects (a phrase taken from the bonus features on the DVD) were all well put together, adding to the fun.
Monsters Unleashed involves Mystery Inc. in their hometown of Coolsville, attending the opening of the Coolsonian Criminology Museum, where the costumes of monsters the gang faced in the cartoon are on display. However, the Evil Masked Figure attacks, stealing the costumes and transforming them into realistic-looking monsters who all seek revenge on Mystery Inc. However to make matters worse, a trash-talking news reporter Heather Jasper Howe berates the gang and turns the city against them. Fred, Daphne, Velma, Shaggy and Scooby Doo must fight and run for survival and regain the confidence of Coolsville.
The portrayal of Fred and Daphne are greatly improved and a lot more funnier than in the first film where they were greatly out of character. Velma is generally the same as before, but the presence of a romantic interest for her is a new side to her. As for Shaggy and Scooby, they are hilarious and really emotional.
It was really great to see a lot of references to the classic shows. The monsters are all accurate to their cartoon versions with some changes to make them look realistic. Among the monsters are the ghostly Black Knight, the electrifying 10,000 Volt Ghost, the vicious Pterodactyl Ghost who steals the monster costumes, the comical duo of the Skeleton Men, Captain Cutler who is a deceased deep sea diver with a glowing helmet, gargantuan fire-breathing Miner 49er, boggle-eyed Zombie who covers an unfortunate news reporter in slime, the massive blob that is the Tar Monster, and the Cotton Candy Glob who meets his end by Shaggy and Scooby's stomachs. Other monster costumes appear, heavily similar to their cartoons forms.
I recommend this film is anyone who likes Scooby Doo as it is really fun and enjoyable. Although there are some swear words used, a couple of scary images (and disturbing ones too), and Scooby Doo wearing an afro and dancing for a little while, this film is colourful and memorable experience to watch.