1) An animated TV series for kids by Bruce W. Timm and Paul Dini playing on Saturday mornings on the CW or FOX or Cartoon Network.
Amber Heard as the voice of Rachel, Aaron Ashmore as the voice of Jake, Jessica Szohr as the voice of Cassie, Victor Rasuk as the voice of Marco, Hugo Weaving as the voice of Visser Three and Tony Goldwyn as the voice of Principal Chapman.
2) A much darker and teen-oriented TV series for the CW. Here, the gang is 16 rather than 13.
It's 4 seasons long tops. 45 minutes long for each 24 episodes of each of the maximum 4 seasons. Very big budget for this limited series because of expensive f/x. (IF there's a season 5, it will be set 4 years after the events of the last season.)
*Adapts all the regular books and the megamorphs books with original stories filling in the rest of the episodes in the four seasons. **Brian Henson directs the two-hour pilot which is an adaptation of "The Invasion." (Stephen Norrington could also work). Developed for television by Mike Werb and Michael Colleary.
The theme song is "Hemorrhage (In My Hands)" by Fuel and "What I've Done" by Linkin Park plays at the end of the pilot. ("It Ends Tonight" by All American Rejects and "Savin' Me" by Nickelback and "From Yesterday" by 30 Seconds to Mars and "Fine Again" by Seether and "Have you passed through this night" by Explosions in the Sky are also featured on the soundtrack.)
Each of the four megamorphs books is adapted into a two-or-three parter for each one of the four seasons. "The Andalite's Gift" is a two-parter and the season 1 finale. "In the Time of Dinosaurs" as a three-parter in the middle of season 2. "Elfangor's Secret" as a three-parter for the beginning of season 3. "Back to Before" (minus the deus ex machina ending; the resolution will be completely changed) as a two-parter in the middle of season 4.
It's set in Seattle rather than Northern California but the location will only be alluded to rather than outright revealed until the final episode.
Marco is 100% Hispanic rather than only 50% Hispanic from his mother's side. Eva, his mother, dies in the series.
"The Andalite Chronicles" and "The Hork-Bajir Chronicles" (and maybe "Visser") are all adapted as straight-to-DVD movies. There will be plenty of references to the past of these characters in the TV series so know one HAS to see these films to understand what's going on in the show.
The Andalite homeworld is actually given a name rather than being unlikely referred to as 'the Andalite honeworld.' The planet is called 'Andal' now.
Hugo Weaving as the voice of Visser Three. Tony Goldwyn plays Principal Chapman.
The Yeerks don't get the morphing cube.
The Hork-Bajir are puppets, the Taxxons are CGI, the Chee are puppets and CGI, the animals are puppets trained and CGI and the Andalite's are costumed people with make-up and puppets.
Like the original TV series, you can morph clothes and shoes just fine. (The rest of the rules still apply though ie. the two-hour time limit, can't morph from one to the next, etc.)
Kind of pointless, but each episode is titled "The [something]" like the books-with the exception of the Megamorph adaptations of course.
An animorph narrates each episode but only a brief voice-over at the beginning (starting with 'My name is [insert name]') and ending of each episode ala "The Twilight Zone."
The Ellimist no longer has that covoluted origin story of before. The Ellimist will simply be a benevolent member of a type 4 alien species called Ellmists (like the Q of "Star Trek"). Same for Crayak. (Go here to learn more about type I, II, III, IV civilizations:
http://en.wikipedia.org/wiki/Kardashev_Scale).
Actually, I'm going to seriously downplay the two super aliens' effect influence on the Animorphs' lives. For example, in "Back to Before," there's not gonna be any of this 'stacking the deck' crap and 'subtemporarily grounded' nonsense and it'll just be a glimpse that the Ellimist shows a tired Jake, ready to quit, how important his role in the fight is.
Tobias is intially stuck as a hawk like in the books but the Ellimist later gives him his morphing power back but does NOT have to live as a hawk and only morph into a human for two hours. (You're obviously gonna have to rewrite "The Illusion" here.)
At the series finale, Applegate's pessimistic ending is gone and Rachel and Tom live and there's no cliffhanger. What's wrong with a happy ending as long as it's not sappy (ex. "Harry Potter" epilouge)?
*Hell, KA Applegate herself can jump in and offer ideas for original episodes from time to time.
**Actually, I want the Jim Henson Company and their puppets to back this show after seeing their great work on the brilliant TV space opera "Farscape" and the film "Labyrinth."