Gurren Lagann the Movie: The Lights in the Sky Are Stars
Gainax
When to watch: Best watched after Episode 27 of Gurren Lagann for full context.
Released April 25, 2009 with a 126-minute runtime, this sequel film covers the post-timeskip story (roughly episodes 17-27) but goes further than a simple recap — adding new Lord Genome backstory scenes, reworking Rossiu's arc, and delivering a notably different take on several major character and plot beats compared to the original TV finale.
Related Series
Frequently Asked Questions
Does The Lights in the Sky Are Stars change the ending?
It keeps the same broad conclusion as the TV series but changes how several character arcs — especially Rossiu's — are handled, along with new scenes not present in the original broadcast.
Do I need to watch Childhood's End before this film?
It's a direct sequel to Childhood's End and assumes that film's version of events, so it's best watched afterward rather than on its own.