The one that was released in theaters in America. That Digimon movie.
Oh my god, 8?! How many of them had the original digidestined, though?
Actually, there are 9. Forgot about the newest one.
Movie 1 - Digimon Adventure (Season 1) - What happened 4 years before the season started
Movie 2 - Digimon Adventure (Season 1) - First appearance of the internet digimon attacking the human world
Movie 3 - Digimon 02 (Season 2) - Road trip across the US to find Willis and his twin digimon
Movie 4 - Digimon 02 (Season 2) - Second appearance of the internet digimon attacking the human world
Movie 5 - Digimon Tamers (Season 3) - Something on an island
Movie 6 - Digimon Tamers (Season 3) - Battle involving runaway trains in Japan
Movie 7 - Digimon Frontier (Season 4) - Floating island where Human-form digimon are at war with Beast-form digimon
Movie 8 - Not tied to a season, individual story. All CG animation.
Movie 9 - Digimon Savers (Season 5) - Vine-like digimon encasing humans in the human world in cocoons, their digimon partners are on their own