A weird species known as Purplings like him.
Sheen is a turbocharged, hyperactive child with an attention span of 0.4 seconds. His best friend back home is a boy genius Jimmy Neutron. He's got a passion for life, TV, guacamole, and a superhero called Ultra Lord. He isn't the best student, but what he lacks in common sense and focus, he makes up for it by displaying curiosity and loads of energy. One day, disobeying Jimmy's specific instructions ("Sheen, Do Not Touch This Rocket!"), Sheen touches a rocket and goes flying into deep space. He lands on a strange planet called Zeenu, where the grand leader thinks that Sheen is destined to bring peace, prosperity, and eternal joy. After the Emperor promotes Sheen to be his number one Royal Advisor, Sheen gets to do virtually whatever he likes, such as battling man-eating creatures and throwing wild parties. Even when the villain Dorkus tries to destroy him, Sheen's crazy ways almost always save the day. On the end of a few early episodes of Planet Sheen, Sheen writes a message to his grandmother in his starlog. All of the messages make no sense, but they sum up everything that happened in the following episode. He doesn't seem at all worried about whether he'll get back to Earth or not. However, since his future self has been seen in "The Tomorrow Boys", it can be implied that Sheen eventually made it back to Earth. Though it is possible that even though the evil dictator future is gone, the future they thought they were heading doesn't exist and so it is possible that Sheen made a new future by himself on Zeenu and will not get back to Earth.
Sheen appeared in Super Mario and Friends: Zennu Quest as minor protagonist. He was attorney in this film, who proved, that Mario didn't want to destroy Dorkus' house and make fire in Elmore. After that he helped Mario bros. and Pucca in journey. At finale he defeated Perfect Dark Gaia and Perfect Chaos in Dorkula's castle with his friends. At epilogue he became writer, who wrote novel, that is based on his adventures.