When the Zula Patrol helps the Pet Catcher out by taking some strange creatures he's retrieved back to Zula, they get more than they bargained for. The creatures create chaos aboard the ship, including trying to eat it! It's up to our heroes to figure out where they belong and get them back there fast... which means examining their appearance and behavior for clues that will lead them to the proper climate for each strange creature. Clock's ticking. Good luck. The Zula Patrol learn all about the Greenhouse Effect first-hand when a seemingly helpful robot shows up at Zula Patrol Headquarters -- and starts making duplicates of itself. It turns out that the robot - sent by Dark Truder - emits powerful amounts of greenhouse gases that can increase the Greenhouse Effect and someday make Zula uninhabitable.