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Jon Pertwee stepped into the role of Doctor Who in the series' seventh-season opener, "Spearhead From Space." Written by Robert Holmes, this adventure finds the Doctor exiled to earth by the Time Lords as punishment for his behavior during the sixth-season finale "The War Games." In the first episode of this four-part adventure, Brigadier Lethbridge-Stewart (Nicholas Courtney) of U.N.I.T. investigates a mysterious meteor shower with the help of scientific advisor Dr. Elizabeth "Liz" Shaw (Caroline John). While all this is going on, the "new" Doctor materializes in his familiar police box -- and before long he, too, has joined the investigation. Beginning its run on January 3, 1970 "Spearhead From Space" was the series' first color episode.