Sixth-grade alien

When aliens come to Earth on an interplanetary trade mission, sixth-grader Tim makes friends with the ambassador's son and together they uncover a plot to sabotage the mission.

Alien boy Pleskit has removed his grandfather's brain from the master tank hoping to gain some insight into human ways, but trouble ensues when he misplaces the cranky organ in the mall.

"When Tim comes home and finds a two-foot-tall orange alien named Beebo Frimbat sitting on his desk, he knows he?s in for a hard time. After all, Beebo is a dedicated mischief maker who thinks trouble is the spice of life. But even Beebo?s past pranks don?t prepare Tim for finding his underwear flying from the school flagpole."--Amazon.com.