Fans of the Animorphs

It makes the Yeerks scarier not only because the Evil Crazies are easy to identify, unlike the Yeerks, but much easier to fight. Rachel scares the creep away easily, but feels like she narrowly escapes Chapman. The Yeerks have so much invested in remaining covert, that revealing them is part of the Animorphs' plans from the very beginning. While they do have some major wins, they are never able to make the Yeerks actually *stop*, or even rethink their commitment to taking Earth, or even slow it down for a bit, until the very end of the series when Jake goes crazy and turns into General Sherman.