context: An early science-fiction/fantasy film filmed and exhibited in what is arguably the first succesful 3D system. The film concerns an absent-minded scientist, Arthur Wyman, (played by Grant Mitchell) who falls in love with his landlady's daughter. The film stars Margaret Irving as his love interest, Mary Langdon. To prove himself as a financial success and win the girl, he proposes to invent an alarm clock that doesnt tick (Remember now, this is 50 years before the advent of the digital-age). Using money that he earned writing an article, he begins work on a radio that can communicate with Mars. He falls asleep while working on the Mars radio, and subsequently dreams of communicating with Mars and its people. He receives various scientific secrets from the Martians including instructions on how to turn clay into gold, coal into diamonds and the manufacture of near-weightless steel. He becomes a successful inventor and wealthy man, but awakens, sadly, to find that it was all a dream. His love, Mary, however, shows up to tell him that his "tickless" alarm invention has been bought for a large amount of money, and that he has indeed become, wealthy.
  Originally released as "The Man From M.A.R.S.", on December 27, 1922 at the Selwyn Theatre in New York City. It was the first feature film to use the alternate-frame sequencing form of film projection to achieve a true stereoscopic 3D image. This early 3D system was called, the Teleview system, and it was invented by William Cassidy and Laurens Hammond, the man who would later invent the Hammond organ. The film met with critical success, but the technology was so far ahead of its time and the expense of installing two interlocked projectors was such, that the that system met with a premature end.The film was later re-cut and re-leased in regular 2D as "Radio-Mania".
question: Who does Arthur contact in his dream?
answer: Mars and its people