Every Doctor Who fan has their favorite incarnation of the role. Mine is the 4th. Tom Baker was and always will be the epitome of the character. And for me, Sarah Jane Smith was the best companion ever. He loved her very deeply, and it is clear why. Courageous, honest, fiercely loyal and kind, embodying everything about humanity that so endeared us to the enigmatic Time Lord. Elisabeth Sladen played the role so perfectly.