Has anyone ever wished that more companies would make crossover titles? Smash Bros aside, I'd never seen anyone but Nintendo do such things, and not until Sonic became their bitch.

My own interests would be in seeing;

Halo meets F.E.A.R. - Master Chief with bullet-time abilities and a more horror, less Nerf feel.

Battle of the Terrans - Starcraft Terrans vs SuCom UEF vs C&C's GDI.

Battle of the Bugs - Zerg vs Tyranids (Yes I know they never made it into DoW, but DAMN it would be a fun fight)

Supreme Mecha Wars - Battletech Mechs vs Earth/Starsiege Hercs vs Heavy Gear "Gears".

... and some cross-genre match ups that would rock;

RTS Doom/Doom2/Doom3 on the Dawn of War engine, or C&C engine...
C&C Renegade used for X-Com's universe.
Freelancer meets Descent...

Well, tell Optimus Chief your ideas if you have any...

How about a god of war game where kratos travells to the present time, ie 2008, with zeus and the rest of the gods and the titans too, and they can have some huge showdown in the game, and the other ppl can get their bombs and stuff..US can try to nuke em but titans destroy em lol... that would sorta be an awesome game.

Neat.

I think these ideas work best if at least one of the crossover items involves dimensional shifting or alternate universes. That way there's a built-in explanation for why they're meeting up.

For example, all of the Dungeons and Dragons games can fit together nicely this way, thanks to Planescape.

There are also lots and lots of alien (and magical) invaders who I'd like to see take on X-COM.
X-COM versus the Zerg!
X-COM versus the vampires (any version)!
X-COM versus the Horde!
X-COM versus the Combine!
X-COM versus the Covenant!
X-COM versus Umbrella Corporation!

Hell, bring 'em all one at once. Why not? They'd probably fight each other as much as they'd fight you.

Condemned meets Viva Pinata. Make THAT one work.

Oblivion meets Viva Pinata. Thousands of Pinatas, you must save them all (or whatever)! Would make the character designing much more interesting(if you were a Pinata).
Edit: a second to late.

I feel the need to mention Robocop vs. The Terminator, and how awesome that game was/is.

How about Dead Rising and that video game where all you do is roll things into a ball? hahaha...can you imagine all the zombies put together like a rubber band ball! hahahaha It's not that funny yet I actually can't stop laughing!

I often thought about a Freelancer-like game set in Homeworld's universe (shortly before the events of Cataclysm, with Hiigara as home planet, maybe even during the Beast War)

zombie katamary...teehee

Katamari Rising, AAAAAAAAHHHH!
I actually like that idea.

Robocop vs Terminator was the absolute BEST crossover to hit the SegaG. I loved that game.

Ninja Gaiden meets Devil May Cry, anyone? Ryu Hayabusa versus Dante Whateverhislastnameis. You just know there would be some seriously epic fighting to be had.

World of Warcraft meets Grand Theft Auto.

You play a con artist who steals people's items and loot to sell on e-bay. All of the NPC's are designed to act like players in the real world in the game. The game world goes on around you while you go on quests to screw with people and hi-jack goods.

Glitches are special abilities as well as hacks.

Actually, Square did this too, with Kingdom Hearts.

I would LOVE to see the Zerg fight the Tyranids.

Sinister Theme Park

Devil May Cry vs. God of war or...
God of war vs. Shadow of Colossus even though I've never played SoC.

OOOh... Sinister Theme Park gave me an idea...

What if the original top-down Grand Theft Auto were to be merged with a game like Mall Tycoon? Happy Violence for EVERYONE!

actually i've always wanted a zombie game with a real beast as the main character, you know, jet li vs. the zombie hordes, something like that. though zombie katamari sounds really kick ass.

i'd like to see a crossover of god of war and prince of persia, kratos vs. the dahaka and the prince vs. zeus, some interesting match ups there.

how about assasins creed and saints row, you run around customizing cars and buying clothes for your guy so you can knife people in the back when they agrivate you and climb the roofs to evade the cops. i think it'd be cool to run the rooftops of a major city with a helicopter chasing you.

Final fantasy 7 meets Medal of Honour. Turn based WWII combat with angsty teenangers. Pretty sure that's never been done before.

SOUL CALIBUR meets SMASH BROS!

Portal and Dead Rising, the ability to trap the undead in an infinite loop would be too tempting to pass up.

John Galt:
Portal and Dead Rising, the ability to trap the undead in an infinite loop would be too tempting to pass up.

Seconded.

Kratos and the Prince of Persia gang rape the lady from heavenly Sword. Rated E for everyone who hates Kratos/that previously mentioned game for the PS3.

American McGee's Alice vs. Capt. Commando.

Ryu Hayabusa's assault on The Sims.

Lolz... Using the portal gun to drop zombies on zombies. I likes your idea John.

[quote=Almightyjoe]not to get overly fanboy

but tyranids would grind the Zerg into a pasty, greasy puddle from which there can be NO return

im not going to put you all through an explanation, but nids have numbers, superior bioorginisms, superior space capabilities, and titans, and can mimic any advantages of the zerg, hive mind would just out-will the Zerg and convert them

Ultralisk v Carnifex... now, that would be epic. quote]

Tyranids would just simply out-evolve the Zerg. Any Zerg that were destroyed would only strengthen the Tyranids.

I would love to see Mario take on Sonic in a track ra.......oh right, that's already happened. Oops

MikeyW:
Condemned meets Viva Pinata. Make THAT one work.

A virus makes the infected go insane. It eventually kills them and swells them into bloated, virus filled flesh sacks. The freshly infected capture the non infected, tie them up near the swollen virii filled corpses. They then are driven to beat the dead swollen meat sacks with bats, sticks and pipes to make them burst; thus spreading the virus to the captives.
Your mission is to find the mysterious source of this virus and beat a cure out of them.

Oh my god, imagine this one... Viva Katamari Pinata. You roll up a katamari in the Viva Pinata garden, but if you go too fast, the pinatas bust and end up as just some candy (1/10 mass).

Metroids (or whatever the hell the plural for it is...) vs flood vs space pirates vs Taidan

no good guys at all

Actually, I've been thinking of a game based on this very idea.

You play as Damian Cross, a researcher at a military lab working on thought-targetting teleporter technology. (i.e. you think of a place, then the teleporter takes you there)

But, the 'porter takes you into alternate dimensions of the imagination, where you play through famous games and TV shows.

The teleporter is remotely controlled by a glove, named the 'Gauntlet'. Using the Gauntlet, you can scan in parts of the environments you encounter, and blend the information you scanned in order to research new ideas. Once you've scanned certain things, they can become Gauntlet upgrades, allowing you to do certain things. For instance, scan a Replicator whilst in the Star Trek: Voyager universe, and you can summon things like weapons and grenades with the Gauntlet. Scan the Morph Watch in the Ape Escape 3 universe, and you can use physical data to emulate the scanned persons appearance and abilities.

What's more, you can combine acquired data to form new objects and physical configurations. For instance, if you combined Dantes physical data with Mega Mans, you'd get Zero.

This way, you could be a part of the motorcycle escape in MGS3, whilst in a Gauss Warthog with Serious Sam in the passenger seat and Coco Bandicoot on the Gauss gun.

What? I thought it'd be a good combination!

Here's one that I know gets thrown around by the fanboys- Halo and Metroid. Haloid video inspired much?

Or: Halo vs Alien vs Half-Life vs Predator. Which parasitic lifeform will conquer all?

Kefka magically transports himself into the EA sports games and kills everyone. Maybe THEN we'll get something new besides 'roster updates'.

Starcraft VS Warhammer, anyone?

Well, tell Optimus Chief your ideas if you have any...

I lol'ed.

For the Tyranids vs Zerg I must only remind you people that the Zerg also absorbs new creatures into their army after modifying them a bit.

COVENANT VS. PROTOSS

Who would win.......

Heh heh, Captain N meets the criteria here.

blackadvent:
Here's one that I know gets thrown around by the fanboys- Halo and Metroid. Haloid video inspired much?

Or: Halo vs Alien vs Half-Life vs Predator. Which parasitic lifeform will conquer all?

There's a real nice video on youtube, Chief vs Samus vs some attacking force, and eventually chief and samus team up... F**ked if I can remember what its title was.

And Predators arent parasitic.

Khell_Sennet:

blackadvent:
Here's one that I know gets thrown around by the fanboys- Halo and Metroid. Haloid video inspired much?

Or: Halo vs Alien vs Half-Life vs Predator. Which parasitic lifeform will conquer all?

There's a real nice video on youtube, Chief vs Samus vs some attacking force, and eventually chief and samus team up... F**ked if I can remember what its title was.

And Predators arent parasitic.

I actually mentioned the video by name in the original post: Haloid. As for Predators... they just like killing aliens that much.