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|Place of origin:||Earth|
|First mentioned in:||The Pirate Planet|
|Main actor:||David Warner|
At some point the Doctor took Newton on a trip to planet Practas Seven, but according to the Tenth Doctor, Newton didn't take the experience very well and "sat in a corner and whimpered". (COMIC: Final Sacrifice)
Later references Edit
K9 Mark II quoted explicitly his third law of motion "Action and reaction are equal and opposite" while in E-Space. (TV: Warriors' Gate) When the Fourth Doctor quoted his "For every action, there is an equal and opposite reaction" to Romana II, she concluded that Newton invented punting. (TV: The Five Doctors, Shada)