ET caught up with Plummer on Sunday at the premiere of his upcoming film The Man Who Invented Christmas, and spoke with the 87-year-old screen legend about the unprecedented move to recast the star of a movie after the film had been completely finished.
"It isn’t replacing. In a funny way it’s starting all over again because it’s going to be different, naturally," Plummer explained.
"The situation is very sad, because he’s such a talented guy. The whole circumstance is sad," Plummer said. "But I’ve got to forget that and go and do it, because it’s a very well written script and Ridley has been very good."
The Oscar winner also explained that he felt no real hesitation at taking on the role after Spacey, because he had already been in talks to play Getty before the House of Cards actor was cast.
"At one point we were discussing doing it in the early days," Plummer recalled.
Despite the cost of reshoots and the time it will take, Scott has been outspoken about wanting to have the film ready for its initial release date of Dec. 22.
"Yeah, it's quite a push," Plummer said of the reshoot schedule, adding that they plan to start shooting next Monday.
While fans wait to see the how the storied thespian takes on the role of the infamous American business magnate, Plummer is starring in The Man Who Invented Christmas as a different iconic rich misanthrope -- Ebenezer Scrooge -- and he said the chance to play such a famed literary character was "marvelous."