Which actor appeared in every episode of MASH?

Alan Alda was the only actor to appear in every single episode of the beloved television series, MASH.

The Enduring Presence of Hawkeye Pierce

MASH, which ran for 11 successful seasons, was known for its dynamic cast and often poignant storylines. Throughout its lengthy run, many major characters and the actors portraying them exited the show, leading to significant shifts in the ensemble. However, Alan Alda, in his iconic role as Captain Benjamin Franklin "Hawkeye" Pierce, remained a constant, appearing in all 256 episodes from 1972 to 1983. His consistent presence provided a central anchor for the series as other cast members came and went.

Cast Changes and Notable Departures

The series saw a significant turnover in its supporting cast over the years, which often led to dramatic and memorable storylines reflecting the harsh realities of war and the challenges of service. These changes allowed for new character dynamics and kept the show fresh, but Alda's character was consistently at the core.

One of the most notable and impactful departures was that of Lieutenant Colonel Henry Blake, portrayed by McLean Stevenson. As a key supporting player during the first three seasons, his character's abrupt death in his final episode, "Abyssinia, Henry," was a shocking moment for audiences and remains one of television's most memorable exits. This event underscored the show's commitment to portraying the unpredictability and tragedy of wartime life.

The table below highlights the unique position of Alan Alda compared to other significant cast members:

Alda's commitment and central role were instrumental in maintaining the show's narrative continuity and emotional core throughout its entire run, even as its ensemble evolved around him.