The conversing aliens were three giant creatures who inhabited a mysterious planet. For some reason, they were talking about Spaceman Spiff. The aliens were actually Calvin's mom, Heather and dad, along with two of his parent's friends. Trivia The aliens were all hit by Calvin's dart gun. Retrieved from "https://calvinandhobbes.fandom.com/wiki/Conversing_aliens?oldid=31582" Categories: Minor characters Spaceman Spiff universe extraterrestrials Characters in Calvin's imagination One-Time Characters Characters Alter egos Calvin's imagination Alter egos of Heather McLean Alter egos of Calvin's father Spaceman Spiff universe Aliens Alter egos of Calvin's parents Community content is available under CC-BY-SA unless otherwise noted.