Sectaurs
The Set-Up: A toyline that only lasted one year - perhaps because the world was as grossed-out by the idea of half-insect half-humans as I was when I was ten years old (Nonetheless, props to whoever decided that the character's giant-insect pets/horse-like-equivalents would be gloves, so you could make their legs move) - Sectaurs followed a He-Man-esque model of quasi-mystical good guys ("The Shining Realm of Prosperon," led by the heroic Prince Dargon) versus equally-quasi-mystical bad guys ("The Dark Domain of Synax," led by General Spidrax) on a planet called Symbion.
Was There A Franchise? Comics books, cartoons and kids storybooks.
The Movie: Embrace the alien, and CGI everything to make it look weird and wonderful. Play up the mythical aspects and turn it into a kids franchise with teeth.

Centurions
The Set-Up: In the "near future," three (later five, but no-one remembers the last two) men fight terrorists (led by the aptly-named Doc Terror) by wearing weirdly weaponized robotic suits that give them something approaching superpowers. Despite being the product of the mid-80s, their tagline of "PowerXtreme!" was curiously a decade ahead of its time.
Was There A Franchise? Cartoons and comic books.
The Movie: It's GI Joe with added technology. Seriously, how can this fail? Just remember to rename the bad guy.

Adventures of The Galaxy Rangers
The Set-Up: The Old West becomes the New West as mankind moves off-planet and colonizes the universe, reverting to cowboy style in the process. The concept behind Galaxy Rangers offered a chance to mix-and-match moments of American history as the Rangers themselves - essentially cyborg versions of Western lawmen, riding robotic horses - fight against a "vast and crumbling Empire" ruled by The Queen of the Crown. Oh, and they're against slavery, as well.
Was There A Franchise? Just a cartoon.
The Movie: Pull back on the sleekness of the technology, and give us a steampunk revisionary version that's more Firefly than Wild Wild West.

MASK
The Set-Up: Pretty much "What if Transformers weren't robots but could still transform," MASK - which stood for Mobile Armored Strike Kommand, proving that even the US Government aren't above bad spelling when a good acronym's at stake - was a GI Joe-esque anti-terrorist squad who used vehicles that had alternate combat modes against VENOM (Vicious Evil Network Of Mayhem). Both sides also had helmets that gave them special powers, which may have been a concept too far, really.
Was There A Franchise? Cartoons, comic books, and video games.
The Movie: Oddly enough, MASK was brought into the GI Joe franchise last year in the toys, so maybe this perfect mix of Joe and Transformers is already taken care of, in terms of Hollywood.

Power Lords
The Set-Up: Another failed toyline that ripped off Masters of The Universe, Power Lords saw Adam Power use the Cosmic Power Jewel to become Lord Power, fighting evil dictator Arkus. Much more amusing were the henchmen, who had names like Bakatak, Disguyzor and Drrench, demonstrating how desperate toymakers could get when deadlines loomed.
Was There A Franchise? Comic books and video games.
The Movie: Actually, maybe they should just make the Masters of The Universe movie instead, as this is so clearly stolen from those toys.

Spiral Zone
The Set-Up: Ignore characters with names like Dirk Courage and Benjamin Davis Franklin, and concentrate on the admittedly-awesome concept: A mad scientist hijacks a space shuttle to turn half the planet into an altered state called the Spiral Zone, where everyone within becomes a mind-controlled zombie. Five soldiers with specially-constructed suits to combat the Zone's effects are sent inside to destroy the Zone Generators and save the world.
Was There A Franchise? Cartoons and comic books.
The Movie: Drop everything other than the basic idea, and make it into a dark action movie with Christian Bale working off his Terminator karma. This is one child dystopia that deserves to be brought back meaner and more hardcore than before.

Zoids
The Set-Up: Robotic dinosaurs and ancient creatures trapped in permanently-ongoing wars on alien planets, although if you read the British tie-in comic, you'd know there was much more - and much, much ripped off of popular movies of a few years previously - going on.
Was There A Franchise? Internationally, comic books and cartoons, but not in the US.
The Movie: Is it too much to ask for Jurassic Park: The Robots? Other than simply adapting the UK comic story (Spaceship full of humans crashlands on Zoid planet, characters act out Alien and Terminator cliches), I can't think of any other way to do it.

Crystar
The Set-Up: Another fantasy toyline, but one that wasn't, surprisingly, ripped off from He-Man, Crystar started life as a pitch from Marvel Comics to various toy companies before Remco bit the crystal bullet and manufactured Crystar and his crystaline brothers and Moltar and his fire-themed minions. Despite offering dragons, castles and personifications of a metaphysical battle between order and chaos, the line only lasted one year.
Was There A Franchise? Only comics.
The Movie: Tone down the Chaos/Order subtext, ramp up the "warring brothers" aspect and go all-out on the fantasy - Give us a full-on Lord Of The Rings set on another planet, with the kind of scope and scale that only Peter Jackson or James Cameron could think of.

Rom The Space-Knight

The Set-Up: Sure, the toy - manufactured by Parker Brothers, and originally called COBOL - may have flopped spectacularly in the US, but the cyborg space warrior lived on for years afterwards in his Marvel Comics series, and even longer in our hearts.
Was There A Franchise? Only comics.
The Movie: Redesign Rom to be slightly less... boxy, and pull in The Invaders paranoia from the comic book, and you've got something with an obvious enough hero to play well in multiplexes but with the potential for something much more subtle and sneaky for those who want to look at it that way.

Micronauts
The Set-Up: If ever there was a toyline that deserved a movie, it's this space opera line adapted from various Japanese figures, especially considering that it's the line that indirectly gave birth to Transformers and the 1980s revival of GI Joe that made that franchise what it is today.
Was There A Franchise? Only comics.
The Movie: With "Time Travelers", Mega Cities, Space Gliders and villains who look like Darth Vader, there's surely only one option: Try to create the next Star Wars, complete with new cultures, new danger and derring-do, and an empire that could support Baron Karzas and Acroyears... whatever an Acroyear turns out to be.

Street Hawk: Few people remember Street Hawk, which tried to do for motorcycles what Knight Rider had done for cars and Airwolf had done for helicopters and Ernest Borgnine's career; namely, make them both cool and an indestructible force against crime. The 1985 show only lasted 13 episodes, but nonetheless introduced a whole generation of children to the idea that any motorbike that could shoot things and go up to 300mph was really awesome, even if it was ridden by someone called "Jesse Mach". It also introduced a whole generation of children to Tangerine Dream, who did the opening theme music, but that's not quite as cool.

Super-Cycle: Okay, so the Forever People's Super-Cycle may have three wheels, but it also had a few other things on its side: The ability to fly, for one. The ability to turn intangible and invisible, for another. And then there was that whole "being able to fly, and also transform into a protective shield for its owner" thing. Oh, and the fact that it could create a Boom Tube to travel anywhere within the known universe was pretty cool, as well. In fact, only one thing stops the Super-Cycle from being the most awesome bike ever created: the fact that it was revealed to be alive, then had sex with another Super-Cycle before retiring to take care of its baby cycle, Kirby. And, no, I only wish that I was making that last part up.

Condor: For fans of the mid-80s toyline MASK, there was only one character you really wanted to be: Brad Turner. Brad had it all - He was a rockstar, hill-climber (I love that that was part of his bio back then; was hill-climbing cool in the 80s and I missed it?), part-time pilot and, most important of all, the owner of Condor, a bright-green bike that turned into a helicopter... or, at least, a helicopter-esque bike. It was the kind of thing that made your crime-fighting a little easier, if a little less subtle. But then, when you're into the rockstar, hill-climbing life, who wants subtle?

Lawmaster: Judge Dredd's bike may, technically, have already made it to the silver screen in 1995's Sylvester Stallone vehicle but pretending that that movie doesn't exist hasn't steered me wrong yet, so why stop now? And the quality of any movie shouldn't be held against a bike as beautiful as the Lawmaster, which not only has a turbo boost strong enough to propel it into the air for however long the plot demands, but also boasts a laser, twin machine guns, a stun-gas-grenade launcher and AI autopilot amongst its hidden features. It even comes with its own CB radio... but then, it was created in 1977.

Speeder Bike: There may have been no wheels to speak of on these babies, but if any one of you pretends that you didn't want to ride one when you saw Return Of The Jedi as a kid, then you're lying. Not only was the speeder bike chase the best part of the movie, it was almost the only good part altogether... yet it was so good that it made you want to sit through all the Jabba and Ewok stuff just to see it again.

Admit it; if Death Race had featured these five bikes, it would've been a box office smash.