Trequel vs. Prequel

Trequelnoun

A work following a sequel; the third in a series, particularly of films.

Prequelnoun

(narratology) In a series of works, an installment that is set chronologically before its predecessor, especially the original narrative or (perhaps improper usage) any narrative work with at least one sequel.

Prequelnoun

a story or film containing events which precede those of an existing work

Prequel

A prequel is a literary, dramatic or cinematic work whose story precedes that of a previous work, by focusing on events that occur before the original narrative. A prequel is a work that forms part of a backstory to the preceding work.