So here's the one where they go to Nazca and become line drawings and have to fight Felldrake and Sheldgoose like that, and meanwhile April May and June infiltrate Sheldgoose's mansion to try to figure out what's up with the barrier. Does that about cover it?
I like that title, but it's no lie: this one is a substantial step down from the last few. The line drawing business is reasonably cool-looking, I guess, and it DOES come alive a bit in the aerial chase scene where everyone's drawing cannons and whatnot to attack everyone else, but eh. It's mostly pretty uninteresting. As is the infiltration sequence; it's great to give AMJ a more prominent role and all, but it was not done in a super-compelling way here. I didn't even care for the song; it felt forced and unnecessary in a way that previous musical numbers haven't. I guess I liked the intensely Midwestern Nazca guardian lady. She and the monkey look really strange in the "real" world.
Also: "If the earth is destroyed, he will be too! He's evil, not insane!" I dunno, man: he wanted to "cover the world in fire" back in the Easter Island episode. Are you sure you've thought this through?