Q: Name a famous movie in 4 letters. Change one letter and anagram the result to name another movie that came out 20 years later. Then change one letter in that and anagram to name a third movie that came out 29 years after the second one. What movies are these?It doesn't help that I thought I was looking for a famous movie in 4 words. Then I made a different assumption that messed me up. And finally, I got a different release date for the first movie. Anyway, if you take the last movie, change one letter and rearrange, you get a word that describes these 3 movies.
Edit: For Dr. No my first search came up with the U.S. release date being 1963 rather than the U.K. release date in 1962. For the extra puzzle, you can perform the same operation on THOR and get TRIO.
A: DR. NO (1962), TRON (1982), THOR (2011)