Professor Katmandu’s dotty old British explorer friend, Dr. Rodenthal, has disappeared in the depths of the jungle, as he investigates the existence of an ancient Incan device called the Sun Eater – a device so powerful that it can actually harness the sun and use it for evil purposes. When the Trekkers are sent to investigate what happened to him, Mo’s impulsive actions and gung-ho nature cause the Mission to be put at risk. It is only when Mo’s impulsivity puts both him and Dr. Rodenthal in danger that Mo realises there’s a time to ACT and a time to THINK, and it’s important to know the difference.