Animorphs
Starring Shawn Ashmore, Brooke Nevin, Paulo Costanzo, Joshua Peace, Eugene Lipinski, Nadia-Leigh Nascimento, Boris Cabrera, Richard Sali, Christopher Ralph
It's a fantasy and kids show, and has a rating of 6.5 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from Spain.