Earthling Ambassador (Space Brigade 1)

Nicola Berry has only one day left to save the world. Armed with little more than her two closest friends, her annoying brother, her more annoying archrival, and an unusually tall alien named Shimlara, Nicola’s not sure she’s up to the task. She must convince the awful princess of Globagaskar to end her sinister plan of turning the Earth into a giant garbage can.