In the middle of the 21st Century, gadgeteer Hiroshi Ozora has created the crowning achievement of his brief career: the Mol Unit -- a device which can enclose its user in a customizable pocket dimension, protecting him from all harm and allowing him to interact with the world in ways that would seem to defy physical laws -- in effect, to become Franchise/{{Superman}}. Naturally, the lean and lanky Hiroshi sculpts the "event horizon" so that he looks like a muscular SuperHero when the device is activated. Its only drawbacks are that the Mol Unit can only operate for 666 seconds at a time, and its user must be nude or else the formation of the event horizon shreds his clothing.

Hiroshi intends to show off the Mol Unit to his old mentor Professor Amagi, with whom he shares both a friendly rivalry as a technologist and a love of old 20th-century devices. But before he gets a chance, agents of a mysterious new supervillain calling himself "Professor Machinegal" strike the social event they are both attending. Piloting insectoid mecha, they attempt to steal its centerpiece -- a painstakingly restored Formula One race car from the 20th Century. Hiroshi is forced to actually use the Mol Unit to stop the thieves -- and in the process becomes Tokyo's first superhero, Moldiver.

Afterwards, Hiroshi's ditzy younger sister Mirai becomes suspicious and investigates, eventually finding his development notes and system. Intrigued and excited, she modifies the Mol Unit so that has a second "look" -- one that's more ''Franchise/SailorMoon'' than Franchise/{{Superman}}. Unfortunately, the changes add just a ''little'' instability to the Mol Unit, making it impossible for the wearer to be completely sure just which appearance he -- or she -- is going to get when it activates.

As Mirai gradually assumes the mantle of Moldiver from Hiroshi, matters swirl around them and seem to converge: Machinegal's continuing depredations, an accelerating deep space exploration program, the unexpected discovery of a maximum number of uses in the Mol Unit, the arrival of a mysterious ''third'' Moldiver, and even a family friend on whom Mirai has a crush. Everything is resolved in a romantic and optimistic climax that is conclusive but still holds out the possibility of more adventures.

''Moldiver'' is a six-episode {{OVA}} miniseries produced in 1993. Traditionally animated, it generally has good to excellent production values. [[Creator/{{Geneon}} Pioneer Entertainment]] brought it to the United States as part of its very first salvo of anime imports in the early 1990s, and as was usual for Pioneer at that time, the dubbing cast is one of the best.

The story is clearly having fun playing with both the superhero and {{magical girl}} cliches in a setting that would seem to be inhospitable to both, and it's not afraid to turn other cliches on their ears, as well -- one of the most delightful ironies in the series is that the "civilian identity" of the villainous Professor Machinegal is also the lowest-bidder contractor tasked with the job of repairing the damage caused by his own crime sprees -- damage that escalates whenever Moldiver gets involved, driving him to distraction with the plummeting return-on-investment he gets from his crimes.
!!This show provides examples of:

* AttentionWhore: Mao
* BlandNameProduct: [=WcDonalds=], ZIC (a reference to the show producers, Creator/{{AIC}})
* ByThePowerOfGreyskull: Subverted
* ClarkKenting: Amagi/Machinegal; All he did was change his clothes and put on some goggles.
* ClothingDamage
** NakedPeopleAreFunny: Mirai ''always'' ends up naked when Moldiver's power runs out.
* TheDitz: Mirai
** GeniusDitz: Mirai again: within a couple hours of discovering her brother's work, she is able to re-engineer it to her own specifications. Despite having no technical training.
* GadgeteerGenius: Hiroshi
* HenshinHero: The Mol unit's transformation only lasts for 666 seconds.
* HumongousMecha: Professor Machinegal's prefered method of attack.
* IdiosyncraticEpisodeNaming: The first letter of episode one to five's [[http://en.wikipedia.org/wiki/Moldiver titles]] + the first three letters of episode six's = [=MOLDIVER=].
* IdolSinger: Amy Lean
* ItMustBeMine: Professor Machinegal is already wealthy, respected and famous, but there are technological artifacts he can only get by stealing, and he doesn't think anyone but him are worthy of them anyway. Hence, supervillainy.
* MagicalGirl: The Mol unit is technological rather than magical, but otherwise Mirai is a solid example. Her costume design was certainly inspired by magical girl shows.
* MagicPants: Parodied oh so much
* MissionControl: Hiroshi becomes this after Mirai tampered with his costume.
* MouthyKid: Nozomu
* TheProfessor (lightly subverted)
* TheRival: Several rivalries, on several levels. There is Amagi vs. Hiroshi, Mirai vs. Mao..
* RobotGirl: Machinegal's Dolls; subverted in that they aren't at all robotic in appearance or behavior, and some viewers may not realize their nature until the horrific moment described above.
* ShoutOut: ''Moldiver'' has a [[TheCameo cameo]] in episode 8 of ''Anime/TenchiUniverse''.
* ShoutOutThemeNaming: Machinegal's Dolls all bear the names of famous Western and Japanese models and actresses, the most obvious being [[Creator/NastassjaKinski Nastassja (Kinski)]], [[Creator/VivienLeigh Vivien (Leigh)]], [[Creator/BrookeShields Brooke (Shields)]], and [[Creator/ElizabethTaylor Elizabeth (Taylor)]].
* SuperHero: Moldiver was designed to look like a classic comic book superhero.
* TeamShot: See the page image.
* TeenGenius
* TransformationSequence
* YouFailPhysicsForever: The entire outer space battle in episode 2.