Each of the pairs of pictures at the bottom of the puzzle clues a movie franchise, sorted alphabetically by title (as they appear in the film titles, ignoring leading articles). Some pairs clue the franchise title, while others may clue elements of the plot or characters. The franchises, in the order depicted, are:

• 3 Ninjas
• Air Bud
• Alvin and the Chipmunks
• American Pie
• Austin Powers
• Before
• Bourne, The
• Children of the Corn
• Crow, The
• Cutting Edge, The
• Diary of a Wimpy Kid
• Dragonheart
• Fifty Shades
• Friday the 13th
• Hellraiser
• Ice Age
• Land Before Time, The
• Ma and Pa Kettle
• Mad Max
• Mirror Mirror
• Nightmare on Elm Street, A
• Police Academy
• Resident Evil
• Revenge of the Nerds
• Road to
• Sharknado
• Spy Kids
• Starship Troopers
• Substitute, The
• Terminator
• Transformers
• Tremors
• Twilight
• Underworld
• Wishmaster
• X-Men

The flavortext refers to “series” and notes that the Pi Day Town residents “only know their neighbors on a surface level.” In addition, the title of the puzzle consists of the last three letters of “before” and the first three of “after.” Each of the fractions in the first three and last three rows of the table is sandwiched by two trigrams that are the end of a “before” item and the beginning of an “after” item; specifically, these are the end and beginning of the subtitles occurring before and after a particular film in the series.

For example, the “(4/7)” in the upper left represents The Twilight Saga: Eclipse, which occurs between New Moon (ending in OON) and Breaking Dawn, Part 1 (starting with BRE). ECLIPSE has seven letters, and the fourth of these is I, so the fraction can be replaced by the letter I. The 36 letters generated this way are as shown:

Once these 36 letters are filled in, there are now six more pairs of trigrams surrounding fractions, reading down each column. No clues are given for these franchises, but they are intentionally six of the most successful film franchises of all time, which will hopefully have seemed conspicuously absent from the initial set:

The resulting letters, OOM KIN, form one more pair of trigrams from one more unclued franchise: the Indiana Jones film series, in which the phrase appearing between TEMPLE OF DOOM and KINGDOM OF THE CRYSTAL SKULL is LAST CRUSADE, the answer to this puzzle.