Oh, also, for some reason so much of Megadeth's 1994 album Youthanasia screams "Animorphs". Not so much lyrically, at least most of the songs, but there are some standouts like "Blood Of Heroes" and such that fit a lot with the final arc. But just musically, the tone, moving away from the aggressive thrash-metal they were known for and into this sort of slower, moodier chunky-riff vibe, it's really sort of somber. Even the title "Youthanasia", while not what the song's about, sort of implies that kids-forced-into-a-war vibe.