: It is highly recommended to watch both The Semi-Final episodes before the movie to understand the character reunions and the state of Edo.
: A major subplot involves Kondo being sent to Planet Gorilla to marry Princess Bubbles for diplomatic reasons. Gintama: The Final Episode 1
: The movie itself (titled Gintama: The Final or The Very Final in the West) begins with a parody of Dragon Ball Z to recap earlier events. : It is highly recommended to watch both
Watch these summaries and clips to understand how 'The Semi-Final' leads into the grand finale: Gintama: The Final Episode 1