Gameplay
For the most part, MDK2 is a run-and-gun third-person shooter. However, unlike the original game, MDK2 features three player characters, each with their own unique set of abilities, skills, weaknesses, and style of gameplay. As such, the general game mechanics are more varied than in the first game, with the inclusion of more platform and puzzle based elements than before. Except for the last level of the game, which can be played with any of the three playable characters, the player cannot choose which character to use in any given level; each level can only be played with a specific character, and as such, the level design of each level is specifically geared towards that characters' abilities.
Kurt Hectic
Kurt's levels play very similarly to the previous game. As before, the player must frequently use his "ribbon chute", a parachute contained within his outfit that can be used indefinitely. The chute allows Kurt to make long jumps, survive long falls, and utilize updrafts. It deploys immediately, and retracts automatically when not being used. Kurt's weaponry includes, but is not limited to, grenades, decoy dummies and cloaking shields. Kurt's main defense is his "Coil Suit," a skin-tight armor made of a Kevlar-like material. His weapon is a chain gun, which is attached to his arm, and carries unlimited ammo. His other weapon is a sniper gun, which is created when he detaches his chain gun from his arm and mounts it onto his helmet. The sniper weapon can zoom up to a mile, and has the capability of supporting multiple types of ammunition, including homing missiles, mortar shells, sniping grenades and bouncing bullets. However, when Kurt is in sniper mode, he is only able to strafe, he cannot move forwards or backwards, and can thus be easily targeted by enemies.
Max
Max, a two-legged four-armed genetically engineered robotic dog, is the toughest of the three characters, with 200 health points. His gameplay is focused on high-impact firepower; standing on his two back legs, he can equip and shoot up to four guns at once. He has access to numerous weapons, such an uzis, shotguns, Magnums and gatling guns. Ammo is limited for all weaponry except his default Magnum. He is also able to wear two different types of jet pack. The standard jet pack uses fuel and when empty, must be refuelled at a fuelling pump. The atomic jetpack does not use fuel, instead refilling automatically when not in use.
Dr. Fluke Hawkins
Dr. Hawkins levels focus on puzzle solving and platforming, with some elements of combat. He is the weakest of the characters, with only 60 health points. Most of his gameplay revolves around combining objects to create new objects, which in turn allow him to proceed through the level. He has two independent inventories, one for his right hand and one for his left. As such, each hand can hold a different item at the same time. Items from one inventory can be combined with items from the other, but items within the same inventory cannot be combined. His main weapon is an atomic toaster, which shoots radioactive toast.
Plot
The game begins moments after the conclusion of MDK, with Kurt, Max, and Dr. Hawkins celebrating their victory over Gunther Glut, and thus saving Earth from the alien invasion. However, in the midst of their celebrations, they discover a remaining Minecrawler heading towards Edmonton. Kurt destroys it, but as he awaits to return to the Jim Dandy space station, he is taken prisoner by a massive alien. Meanwhile, on board the Dandy, Hawkins discovers that communications with Kurt are being jammed by a nearby alien ship. Max heads to the other ship to free up the communications. However, upon doing so, he too is taken prisoner by the same alien. The alien then contacts Hawkins on the Dandy, telling him his name is Shwang Shwing, and the invasion of Earth is not over.
Shwing sends a group of aliens onto the Dandy, but Hawkins is able to fight them off and teleport Kurt back to the ship. He then sends Kurt to the alien ship to save Max. However, shortly after Kurt's departure, Hawkins is taken prisoner by the aliens still on the Dandy. Kurt frees Max, and together they fight Shwing. During the battle, they learn Hawkins has been taken prisoner. Shwing initiates the auto destruct sequence, and jumps into an energy stream, followed by Kurt, whilst Max heads back to the Dandy to save Hawkins. Upon destroying a robotic dog constructed by the aliens, Max frees Hawkins, and uses a device on the dog to open a portal into which he heads. Meanwhile, Hawkins remains behind to take back control of the Dandy. After finally ridding the station of aliens, he finds the co-ordinates of their home world and sets course.
Meanwhile, Shwing emerges from the energy stream on the home world, Swizzle Firma, with Kurt following close behind. Kurt destroys his ship, and an injured Shwing tells Kurt the attacks on Earth have been ordered by Emperor Zizzy Ballooba. Meanwhile, Max emerges from the portal on Swizzle Firma, and learns Ballooba plans to launch a doomsday device at Earth which will obliterate the entire planet. Max kills Shwing as he attempts to launch the device, and then destroys the device itself. He then meets up with Kurt and heads to Ballooba's palace. Meanwhile, Hawkins pilots the Dandy to Swizzle Firma and contacts his colleagues. Aiming the station's guns at the palace, he attempts to teleport Kurt and Max back to the Dandy, but accidentally teleports himself to the planet, and so heads to meet with Kurt and Max.
The three storm Ballooba's palace. Upon confronting Ballooba, he admits he's only trying to destroy Earth for his own amusement, because, since he mastered space and time, he has become bored. A battle ensues between the three heroes and Ballooba, with the heroes emerging victorious. The closing sequence depends on which character the player uses for the final battle. Kurt resumes his duties as janitor of the Dandy, perturbed by the idea of becoming a celebrity. Max becomes the new emperor of Swizzle Firma, forming an interplanetary alliance with Earth. Hawkins is welcomed back to Earth, no longer shunned by his peers, and gets to work on his lifelong ambition - creating an atomic robot zombie army.