Monster Fighters is a theme introduced in May 2012. To date, ten sets have been released. Seven of the sets contain at least one Moon Stone, and in the background story, the monsters attempt to collect them to unleash doom on the Earth by eclipsing the Sun forever, allowing the land of monsters into the minifigure's realm. The stones are based on the monster contained in its respective set. A band of Monster Fighters, led by Doctor Rodney Rathebone, tries to find the stones before the evil Lord Vampyre uses them to eclipse the sun forever.
All the Monster Fighters sets follow a similar pattern. Every one features a lair/vehicle of some sort for a monster with a moonstone somewhere in it and a vehicle for the Monster Fighters. (with the exception of 9468 Vampyre Castle, which contains six moonstones and 10228 Haunted House, which contains no Moonstones, nor Monster Fighters or Monster Fighter's vehicle.) 9461 The Swamp Creature contains a swamp boat for Frank Rock, and a small marshy lair for the The Swamp Creature. 9462 The Mummy includes a chariot drawn by a glow-in-the-dark skeletal horse, and an autogyro piloted by Ann Lee. 9463 The Werewolf includes a large brown tree (of various shades) inhabited by the Werewolf, and an old car piloted by Major Quinton Steele. 9464 The Vampyre Hearse features, as its name would indicate, a hearse driven by the Zombie Driver. It also features a small motorcycle driven by Dr. Rodney Rathebone.
9465 The Zombies features a tomb inhabited by three zombies, a small podium with a moonstone and a large car driven by Jack McHammer. The majority of 9466 The Crazy Scientist and His Monster, consists of a large laboratory, and a small blue car driven by two Monster Fighters. In 9467 The Ghost Train, a very large train, with three Ghosts riding on it is featured, as well as a plane driven by Frank Rock. The largest portion of 9468 Vampyre Castle is a large castle, although it also includes a car driven by Monster Fighters.
There is no particular colour scheme for the theme, although grey and black pieces are featured prominently in many sets, and every one except for 9461 The Swamp Creature and 30200 Zombie Coffin Car contains at least one glow-in-the-dark part. Though each set does include a colour scheme to match either the monster or its background.
Lord Vampyre, a powerful vampire, was pestered by his wife to get her a Moon Stone, but when Lord Vampyre finally found it, he realized the magical power it possessed and decided to keep it for himself. If six of them were brought together (though there are actually seven in total), they would eclipse the sun and turn day into night forever, so the monsters could roam freely, and they could get to the minifigure realms. To defend the earth from this new spooky threat, Rodney Rathbone put together a band of monster fighters to retrieve the stones before Vampyre collected them to unleash their power on the world. These monster fighters include Frank Rock, Major Quinton Steele, Ann Lee, Jack McHammer, all with monster archenemies and personal vehicles.
- The theme is remarkably similar to the 1987 Monster movie The Monster Squad, which features the same monsters (apart from the Ghosts) and a similar plot.
- There are essentially two set remakes in this line from Studios.
- The theme adds more parts introduced in the Minifigures theme to mainstream sets. A few of the most noticeable parts are the Cave Woman's hair and the Musketeer's sword. Also, many of the antagonists are remade version of figures featured in the Minifigures theme: The Monster, Crazy Scientist, Zombie, Vampire, Mummy, and Werewolf.
- In addition to remaking characters from the Minifigures theme, several of the the monsters have previously been featured in the Studios theme. See Ghost, Frankenstein's Monster, Mad Scientist, Vampire, Mummy, and Werewolf.
- Even though Lord Vampyre only needs six Moon Stones to power eclipse the sun, there are seven in the theme, with the Moonstone featuring a zombie hand generally serving as the extra.
- The theme features a large amount of unique glow-in-the-dark parts, including the ghosts' shrouds, several elements on the Ghost Train, and the vampires' head. In addition to these, spiders, werewolf claws, and the Skeletal horse also glow.
- The Haunted House and the polybags are the only sets not to include a Monster Fighter.
- All the sets have at least one exclusive minifigure, with the exception of the polybags and the system sets 9464 Vampyre Hearse and 9467 Ghost Train.
- There is a short comic on the back of every box, which as Lord Vampyre in his tower, trying to get all the moonstones ready, and finds one missing, the one in the set, then, Lord Vampyre's holding it above him once he has retrieved it, and which every monster's angry about how they were tricked, then, in the next panel, he puts whichever moonstone is in the set onto the Moonstone contraption, and then eclipses the sun forever, making day into night.
- Each Monster Fighter appears in a set with their arch-enemy monster, with the exception of Jack McHammer and The Monster. Jack McHammer was in the preliminary images for 9466, but was then replaced with Major Quinton Steele.
- The only Monster Fighter to appear more than twice is Dr. Rodney Rathbone, who appears in three sets, 9464, 9466, and 9468, most likely due to him being the leader of the team.
- Training With Jack McHammer
- Training With Ann Lee
- Training With Quinton Steele
- Training With Frank Rock
- Training With Rodney Rathbone
- Monster Fighters Race (For iPhone/iPod touch)
- The Monsterland Tales
- Spooky Loops
- Product Map
All of the Monster Fighters sets so far, excluding 9465 The Zombies and the 10228 Haunted House