#37 William Hartnell
Hartnell was a difficult man, and he was also known for his infamous ‘Billy-fluffs,’ which occurred when he misspoke his lines due to exhaustion, illness, or on purpose. He preferred certain guest actors and had high standards.
Nicholas Courtney and Anneke Wills have both commented on Hartnell’s worldview, saying that he has anti-Semitic views and is a racist. However, other actors from similar backgrounds have reported that they get along well with the actor. Without more information, the problem will continue to be murky and frustrating.