After gathering everyone's great comments, I went back to the drawing board and came up with this. I hope I'm getting closer!
The B.I.M - Basic Intelligence Model - Middle Grade
Thirteen-year-old DANIEL BIM plans to spend the afternoon at the swimming hole, but when he discovers a ten-inch alien named ERNIE eating breakfast in his refrigerator, he knows it's not going to happen. Ernie claims an evil lord has it in for him. Daniel doesnít believe it until five mini-UFOís blast his bedroom to smithereens. With Ernieís help, he escapes to the squishy planet of Albin, where he meets the head-strong Princess TYRA. Although she expected him to save her throne, she decides heís not the hero material sheíd hoped for and dismisses him.
Daniel returns to Earth glad to be rid of the crazy aliens, but canít believe his eyes, when he finds Tyra sitting in his math class. Sheís obviously changed her mind. Hero or not, she demands that he saves her planet and refuses to leave until he does. Her demanding attitude doesnít make Daniel want to help her - not at all. He tries to ignore her, but it doesn't work. Instead, his best friend, PETE, falls head over heels for the pretty princess.
Although the aliens promise not to 'force' Daniel into anything, they transfer him back to Albin, this time to the underwater realm of the Mudlumps. Tyra finds the fishy creatures below her princessy level, but their simple nature wins over Danielís friendship. Irritated that Daniel likes the creatures, Tyra reveals his secret past: a clone, created from an ancient heroís blood to stop the evil lord, but thrown away as faulty trash after his birth. She seems to believe that Daniel will help her, now that he knows the reasons behind his creation. Her hopes back-fire.
Daniel doesnít want anything to do with her or the aliens, not when they dubbed him as trash. He returns to Earth, but Tyra isnít giving up. She follows him to school and spreads the rumor that he and her are a couple. Sure that Daniel's been lying and has stolen his girl, Pete refuses to talk to Daniel, and the rest of Danielís friends take Peteís side. Daniel confronts Tyra, but before he can tell her to get lost, she transfers with him back to Albin Ė smack dab in the middle of the evil lordís camp.
Tyra claimes the transfer was a mistake. She didn't want to bring him there. Since the evil lord is waiting outside, ready to execute them, Daniel decides to believe her. With simple tricks he learned on the farm, they manage to escape and flee up a cliff wall. They discover the entrance to a cave, which leads to the Underlands of Albin. The Underland creatures, the MINERS, recognize Daniel as the clone of their long lost ally and friend. They take Daniel to their leader, a golden beast, who insures Daniel that Albin canít be saved by strength, but only through a wise heart.
Back on Earth, Tyra explains that the evil lord is planning an attack on the last 'free' area of Albin. She wants to call her rebels to retreat, admitting that they have never really stood up against the evil lord. Daniel disagrees with her plans and convinces the aliens to fight for their home. The aliens agree under one condition: as true heir to Albinís throne, Tyra must stay on Earth out of harmís way, and Daniel should protect her.
To distract Tyra from the war on Albin, Daniel invites her to the Corncob Festival. As they go to meet up with the only person in school, which is still talking to Daniel, Tyra realizes how difficult sheís made his life and helps him smooth things out with Pete. Just as life seems to be half-way back to normal, Ernie appears. The battle on Albin isnít going as planned. Together with Tyra, Daniel returns to Albin. He has nothing to set against the evil lord's army, but knows that his new found friends, the Miners and Mudlumps do. With their help, Daniel lures the lord's army into a canyon and destroys it. In a last battle with the evil lord himself, Daniel discovers that he's not as weak as he thought, and manges to destroy him.
With Tyra back on her throne, Daniel returns to his quiet life on Earth, but realizes that maybe he doesn't want it so quite after all.