The Fourth Doctor is an incarnation of the Doctor, the protagonist of
the BBC science fiction television series Doctor Who. He was portrayed
by Tom Baker.Within the series' narrative, the Doctor is a
centuries-old alien Time Lord from the planet Gallifrey who travels in
time and space in the TARDIS, frequently with companions. At the end
of life, the Doctor regenerates; as a result, the physical appearance
and personality of the Doctor changes.Baker portrays the Fourth Doctor
as a whimsical and sometimes brooding individual whose enormous
personal warmth is at times tempered by his capacity for righteous
anger. His initial companions were intrepid journalist Sarah Jane
Smith (Elisabeth Sladen), who had travelled alongside his previous
incarnation, and Surgeon-Lieutenant Harry Sullivan (Ian Marter) of
UNIT. His later companions were savage warrior Leela (Louise Jameson),
robotic dog K9, Time Lady Romana (Mary Tamm and Lalla Ward), teen
genius Adric (Matthew Waterhouse), alien teenage aristocrat Nyssa
(Sarah Sutton), and Australian flight attendant Tegan (Janet
Fielding). Fourth Doctor Biography, NetWorth, Height, Age, Weight, Family, Married, Son, Daughter