Why did Sydney Newman invent the doctor?

Sydney Newman did not invent the Doctor; rather, he was a key figure in the creation of the British television series "Doctor Who." As the head of drama at the BBC in the early 1960s, Newman envisioned a show that combined Science Fiction with historical storytelling, allowing for a unique narrative format. This concept led to the introduction of the Doctor, a time-traveling alien with the ability to regenerate, which enabled the character to evolve and remain relevant over decades. Newman's innovative ideas laid the groundwork for what would become a beloved and enduring franchise.