Third Doctor March!Jessica and Phillip barely make it in time for the third installment of their monthly Doctor "in focus" series, based on the YouTube videos of Clever Dick Films. They discuss the Third Doctor era, with Jon Pertwee taking over the newly colourized Time Lord role, with his UNIT gang and new assistants. From the introduction of The Master to a mirror universe, there is a lot to cover in this 1970s Doctor Who era.In their look into the TARDIS library, the couple stumble upon the 1990s Liz Shaw spinoff "P.R.O.B.E." They review its direct-to-video episode, "The Zero Imperative," penned by Mark Gatiss and starring several Doctors.