(2008) can be tricky because it exists in two distinct versions: the original (approx. 138 minutes) and a heavily edited R-rated version (approx. 90 minutes).
The character of Stagnetti or Stagner does appear in "At World's End," played by an unnamed actor. However, there is no evidence to suggest that a movie with this title exists or has been produced. (2008) can be tricky because it exists in