Gundam Evolve (2001)

A series of short films packaged with certain model kits and aired at conventions, the Gundam Evolve series chronicles a number of side-stories, alternative scenes, and even bonus omake from all around the Gundam canon. Featuring a mix of animation media—from traditional cels to 3-D CG rendering to even cel-shaded 2-D animation—these often 5–8 minute shorts cover such events as Domon Kasshu's training (and a bit of a romantic tift with Rain Mikamura) from G Gundam, Amuro Ray battling Quess Paraya from Char's Counterattack, Kamille Bidan training in the Gundam Mk.II from Zeta Gundam, and Canard Pars dueling Prayer Reverie from the Gundam SEED X Astray manga.

Unfortunately the movie Gundam Evolve is not yet available on HBO Max.