What is the Doctor's greatest weakness in Doctor Who?

In the long-running British science fiction TV series Doctor Who, the Doctor is a Time Lord, a time-traveling alien who travels through time and space in a TARDIS, which looks like a blue police box. The Doctor is known for his quick wit, bravery, and ingenuity, but like all characters, he has his weaknesses.

One of the Doctor's greatest weaknesses is his sense of guilt and responsibility. The Doctor has a strong moral code and feels a deep sense of responsibility to help others, often putting himself in danger to save others. He carries the weight of the universe on his shoulders and the guilt of the lives he couldn't save. This guilt can lead to rash decisions and risky behavior.

Another of the Doctor's weaknesses is his arrogance. The Doctor is incredibly intelligent and often believes that he is the smartest person in the room. This arrogance can lead him to underestimate his opponents and make mistakes.

Finally, the Doctor's attachment to his companions is a weakness. The Doctor is known for his close relationships with his companions and often puts their safety above his own. This can lead to the Doctor taking risks or making decisions that put him and his companions in danger.