Journey to the Living Planet! It's Lunella Lafayette's biggest adventure yet, as a voice from the outer reaches of space beckons her and Devil Dinosaur on a truly fantastic voyage - an Ego trip, if you will! Are you ready for Moon Girl to meet--Girl-Moon? Lunella isn't just smart, she's the smartest person on Earth - but what good is that when the problems she faces are intergalactic? And when our incredible duo makes it back to Earth, they might find things a little different than how they remember. What happened to Yancy Street? And who exactly are Devil Girl and Moon Dinosaur?! The story of a young genius and her T. rex pal gets wilder than ever!

Contains material originally published in magazine form as Moon Girl and Devil Dinosaur #19-24.