Space Taxi: Archie's Alien Disguise

In the third book in the series, Archie, his dad, and Pockets visit a planet that resembles medieval Earth in every way but its inhabitants, who have rainbow colored hair and extra eyes. To beat the evil organization B.U.R.P., the trio must disguise themselves as aliens and rescue a princess! When Archie must act on his own, can he find the courage to save the day?