Here are some possibilities:
- The Lord of the Rings trilogy (2001-2003)
- The Godfather trilogy (1972-1990)
- The Dark Knight trilogy (2005-2012)
- The Star Wars original trilogy (1977-1983)
- The Before trilogy (1995-2013)
- The Toy Story trilogy (1995-2019)
- The Indiana Jones trilogy (1981-1989)
- The Back to the Future trilogy (1985-1990)
- The Bourne trilogy (2002-2007)
- The Pirates of the Caribbean trilogy (2003-2007)
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Of course, the original Star Wars trilogy is another strong candidate, but that is a trivial choice.
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