Episodes 14 and 15, released with the first and third BD/DVD volumes.

A 2-episode OVA for Suisei no Gargantia revealed during an announcement at AnimeJapan 2014.

This special is a set of short comedy stories involving Gintoki and his equally-broke sidekicks Shinpachi and Kagura. One day, Gintoki and his comrades are out viewing the spring flowers when suddenly the Shinsengumi appear, arguing that Gintoki has taken their flower-viewing spot. Gintoki's team and the Shinsengumi must then battle for the right to sit in that spot by using a violent version of rock paper scissors.

Dr. Saotome returns from the dead after being seemingly murdered by Getter pilot Nagare Ryoma and threatens the world with his ultimate creation: the Shin Dragon. Ryoma reluctantly teams up with his former co-pilots Jin Hayato and Tomoe Mushashi to combat Dr. Saotome. The pilots must also deal with the mysterious Invaders, aliens that have the ability to possess humans and warp their flesh to form hideous creatures.