Halfway through its run, Gurren Lagann pauses to look back. This compilation episode retells the story so far, from Giha Village to the fall of Teppelin, framed by scenes of the staff writing down the first half's plot.
The sixteenth installment, also known as Entire Polysynthesis, is a recap rather than a new chapter, condensing the important events of the first fifteen episodes into a single retrospective. Woven between the highlights are original clips showing people writing out the storyline of the show's first half, a framing device unique to this episode.
No new story developments occur; the episode exists to consolidate the Beastmen War arc before the series leaps ahead.
Its eyecatches assemble every commercial-break screen from the previous fifteen episodes, with the main title filling the single open slot on each side.
This is the only episode whose title is not drawn from a line of dialogue spoken within it.
The recap pushes the series to 27 episodes, an odd total for weekly anime, which are usually planned in multiples of 13 to divide evenly into a broadcast year. The likeliest explanation is that the compilation was added late in production so viewers would carry the first arc's details into the second.
It first aired in Japan on July 15, 2007, and in English on September 29, 2008.

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The Gurren Lagann compilation episode is Episode 16, also called Entire Polysynthesis, a recap that condenses the important events of the first fifteen episodes into a single retrospective framed by original clips of the staff writing out the story so far.
Episode 16 adds no new story developments since it is a recap consolidating the Beastmen War arc before the series jumps into its second half, so it mainly exists to help viewers carry the details forward rather than to advance the plot.
Yes, Episode 16 is a recap episode that retells the story from Giha Village through the fall of Teppelin rather than presenting new events.
The Episode 16 recap is the likely reason Gurren Lagann runs 27 episodes instead of the more typical 26, since it appears to have been added late in production so viewers would carry the first arc's details into the second.
Episode 16 is the only Gurren Lagann episode whose title is not drawn from a line of dialogue spoken within it, and its eyecatches uniquely assemble every commercial-break screen from the previous fifteen episodes.
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