Gurren Lagann - Episode 20 of Back Arrow has a What else?

Episode 20 of Back Arrow has a "What else? COMBINE!" Reference from Gurren Lagann. Kazuki Nakashima was the writer for both Gurren Lagann (2007) and Back

Viral, Tengen Toppa Gurren Lagann Wiki

Which mecha anime is better to watch first Code Geass,Gurren Lagann,Neon Genesis Evangelion? - Quora

Episode 20, Tengen Toppa Gurren Lagann Wiki

Empowerment Fantasies: Tengen Toppa Gurren Lagann - Slant Magazine

Episode 20, Tengen Toppa Gurren Lagann Wiki

A Rewatch to Pierce the Heavens - Tengen Toppa Gurren Lagann Episode 20 Discussion [Spoilers] : r/anime

Back Arrow - Episode 20 discussion : r/anime

Gurren Lagann: Specials (2007) — The Movie Database (TMDB)

Tengen Toppa Gurren Lagann / Awesome - TV Tropes

A Rewatch to Pierce the Heavens - Tengen Toppa Gurren Lagann Episode 20 Discussion [Spoilers] : r/anime

Tengen Toppa Gurren-Lagann - lurkmore wiki

Gurren Lagann (TV Series 2007) - IMDb

A Rewatch to Pierce the Heavens - Tengen Toppa Gurren Lagann Episode 20 Discussion [Spoilers] : r/anime