noun
triple feature; three-part program
Used for a movie program, event, or broadcast consisting of three works shown together. Often seen in contexts like 三本立ての映画 (triple-feature movie) or 三本立ての番組 (three-part TV program).
今夜は三本立てのホラー映画をやっている。
Tonight they're showing a triple feature of horror movies.
その劇場では毎週土
That theater has a triple-feature screening every Saturday.