I already mentioned some of my ideas, like Tracker (it was also about aliens taking over human bodies, but the hosts died. At least the main character and the main villain would be immune...you can't infest a being that's energy-based. But seeing Zin throw Visser Three accross the room with his mind=win) and Bones, (I'm working on a Bones one) and there's a nice CSI one on FF.Net that's already been mentioned. CSI NY goes along with the CSI class even though they're different shows. (I don't watch Miami, but I ought to write a humor one just for the heck of it, the Yeerk in Horatio Caine telling the Visser "I want a new host, I can't stand this human! He's always talking in such strange ways in here. And I'm getting tired of the thing with the sunglasses all the time." (no offense to any fans of the show).
I do intend to re-write the Dusk crossover mentioned in the other thread. Tobias meets girl with hawk DNA and eyes=awesome crossover potential.
There are some good Maximum Ride ones there, although I have only read some of those books.
I forgot to mention my Planet of the Apes idea...sario rip, multi-lane highway future theory and everyone morphing chimp to try and not get caught. (or gorilla in Marco's case) Oh and since the mutants underground already use thought-speech, I'd love to write Ax's reaction to that. And there's a built in ride back home with the explosion at the end of Beneath if nothing else. Either that or I combine it with the reboot, Rise of the Planet of the Apes...Marco morphing gorilla to hang out with Caesar. Or Cassie, she's the big animal person.
I've never tried Roswell or Buffy, due to them being mentioned as fictional 'verses, but some people have...one had Cassie being called as a slayer. (Buffy *could* be crossed, just because it has so many dimensions...someon e could just get sucked into another dimension somehow. Or it could happen now, after the magic's been sucked out of their world, as much as I loathe the comics.)
I'm a huge Merlin fan, but IDK if I could work in a third time travel story. Plus there's the magic, which, I agree isn't easy to cross. Which saves us from Yeerks invading sparkly vampires lololol. (I did enjoy The Host though) Although that said, it might work with Forever Knight, where the vampirism had a lot of science in it.
I also already mentioned the Dino Squad cartoon...kids who morphed dinosaurs is what that was about. The desire's easy to see.
And in the dinosaur area, I've thought of Dinotopia,(the books, not the crappy TV series) but morphing there would not be easy. All the saurians are sentient and you'd need permission. ANd of course no controllers, unless they could make a kendrona out of sunstones or something. No way off the island to get back to the pool.
Animorphs/Highlander...now that'd be fun. Just what they'd need, immortal controllers. Hard to say with that one, since there is as, to put it like the show, 'a kind of magic', but it's very real world at the same time. At least until they started adding in demons and stuff, *rolls eyes* season six sucked eggs.
I'm surprised on one said Stargate. I don't watch the series, but it'd work. Can you imagine a stargate to the Andalite world? Or Doctor Who. Which I don't watch either.
One more book that would be interesting, there's a teen one out since last year called Stuck on Earth...I'm thinking the author read Animorphs or something. The alien was a slug from a planet with a lot of mud pools and took over a kid to see what humans were like. Except he used the nose, not the ear. And had a way to paralyze him before entering. He also put the kid's mind somewhere else where he could access it when he had to, but it wouldn't be in the way. I kept imagining him crawling in to find a Yeerk already present.
I also think the author of the Molly Moon books read ANimorphs too. However, that book's morphing wasn't like ani-morphing.
Another show that would work is Sanctuary...I only watched some of it, but it's about a place that studies and harbors 'abnormals' or strange creatures. It's on Sfyfy.
*wonders also about Warehouse 13 or Fringe crossovers*