Christopher Eccleston portrayed the Ninth Doctor in the 2005 revival of Doctor Who, marking a significant return of the iconic series. His performance was lauded for bringing a fresh, grounded energy to the character. Eccleston's tenure was brief, spanning only one series, comprising 13 episodes.
Reasons for Departure
Eccleston left the role after the first series due to a breakdown in his working relationship with key production staff, including the showrunner and producers. He expressed discomfort with the working environment and culture on set, which he felt compromised his ability to perform authentically. This decision was not driven by concerns over typecasting, as was initially reported. Instead, Eccleston prioritized personal integrity over career longevity.

Villains Encountered
During his single series, the Ninth Doctor faced several formidable adversaries. Notably, he encountered the Autons, led by the Nestene Consciousness, in the inaugural episode "Rose." He also confronted the Daleks in "Dalek," marking their return to the series. Additionally, the Ninth Doctor dealt with the Slitheen in "Aliens of London" and "World War Three," and faced the Reapers in "Father's Day."
Post-Doctor Who Career
Following his departure from Doctor Who, Eccleston continued to build a diverse acting career. He took on roles in various television series and films, including Heroes, The Leftovers, and Fortitude. In 2021, Eccleston returned to the Doctor Who universe, reprising his role as the Ninth Doctor in a series of audio dramas produced by Big Finish Productions. This marked his first return to the character since his television departure.

Legacy
Eccleston's portrayal of the Ninth Doctor remains a pivotal moment in Doctor Who history. His nuanced performance helped to re-establish the series for a new generation of viewers. Despite his brief time in the role, Eccleston's impact on the franchise is enduring, and his return in audio dramas has been well-received by fans.