This puzzle appeared in Microsoft Puzzle Hunt 15, whose theme was movies.
That event was modular in that each author wrote a module consisting of a few
puzzles and a metapuzzle.
The theme of my module was sequels.
For each row, do this twice: Put a letter in the blank so that it's part of a contiguous word, reading left to right, of at least six letters.
After deriving a pair of letters from each row, reorder the pairs as follows. The first pair should contain an A, the second pair should contain a B, the third pair should contain a C, and so on through the alphabet.