Charlie learns that the Global Space Administration is looking for researchers and explorers to go on the Interplanetary Expedition – a one-way trip to explore the solar system. Carly is nervous because a one-way ticket means that they would never come back! So, both she and Charlie head to the Mars habitat in Hawaii to experience what it is like to live in outer space. Renowned astrophysicist Michio Kaku is a special guest star, playing fictional character Buster Infinity.