The GoShogun Movie, released in 1982, is a combination of episodes 20 and 17 (in that order) from the original series. It includes a summary of key events, snippets from the daily lives and background stories of the characters, and advertisements for fictional products.
Remi, on the verge of death, is a member of the GoShogun team who once saved the world several times. Now an old woman who has retreated from the world, her former team mates gather at her deathbed trying to save her life. At the same time, time goes back to when she was but a small child when she was buried alive and nearly died and when she was still with the rest of her team on a dangerous suicidal mission. As we see her older self struggling to hold on to life, we see that she has done the same thing her whole life through and her former team mates watches helplessly as her hold on life loosens slowly right before their eyes.