As of 2026, December Sky is not permanently free on major ad-supported platforms like YouTube or Tubi (though availability changes). However, you have two excellent legal options:
Why avoid shady "free" sites? Aside from legality, they often have terrible video quality (this movie is visually stunning), broken subtitles, pop-up malware, and missing the incredible jazz soundtrack.
Sunrise Studio poured an unprecedented budget into Thunderbolt. Unlike TV series that cut corners, December Sky features hand-drawn Mobile Suit combat that feels weighty and destructive. The "Thunderbolt" sector is filled with electrical interference, forcing pilots to navigate via sound. The visual of Io Fleming blasting "Take the 'A' Train" through his Gundam’s speakers while dodging debris is iconic.
Before we dive into where to watch it, we must understand what you are watching. December Sky is the theatrical re-edit of the first four episodes of Mobile Suit Gundam Thunderbolt Season 1, originally streamed in 2015.
The Plot:
Set in the Universal Century year 0079 (during the same timeline as the original 1979 Gundam series), December Sky takes place in the "Thunderbolt Sector." This region of space is a graveyard of wrecked warships, providing a deadly obstacle course for Mobile Suit pilots.
The story follows two opposing aces:
The film is not a traditional "good vs. evil" story. It is a visceral, raw depiction of two broken men destroying themselves to prove they are alive. The iconic jazz soundtrack (scored by Naruyoshi Kikuchi) contrasts violently with the silent explosions of space, creating a sensory experience unlike any other mecha anime.
When looking for a "free" version, you might encounter both the 4-episode ONA (18-20 minutes each) and the December Sky movie (roughly 70 minutes). The movie is the superior entry point because:
Mobile Suit Gundam Thunderbolt December Sky Free Now
As of 2026, December Sky is not permanently free on major ad-supported platforms like YouTube or Tubi (though availability changes). However, you have two excellent legal options:
Why avoid shady "free" sites? Aside from legality, they often have terrible video quality (this movie is visually stunning), broken subtitles, pop-up malware, and missing the incredible jazz soundtrack.
Sunrise Studio poured an unprecedented budget into Thunderbolt. Unlike TV series that cut corners, December Sky features hand-drawn Mobile Suit combat that feels weighty and destructive. The "Thunderbolt" sector is filled with electrical interference, forcing pilots to navigate via sound. The visual of Io Fleming blasting "Take the 'A' Train" through his Gundam’s speakers while dodging debris is iconic. mobile suit gundam thunderbolt december sky free
Before we dive into where to watch it, we must understand what you are watching. December Sky is the theatrical re-edit of the first four episodes of Mobile Suit Gundam Thunderbolt Season 1, originally streamed in 2015.
The Plot:
Set in the Universal Century year 0079 (during the same timeline as the original 1979 Gundam series), December Sky takes place in the "Thunderbolt Sector." This region of space is a graveyard of wrecked warships, providing a deadly obstacle course for Mobile Suit pilots. As of 2026, December Sky is not permanently
The story follows two opposing aces:
The film is not a traditional "good vs. evil" story. It is a visceral, raw depiction of two broken men destroying themselves to prove they are alive. The iconic jazz soundtrack (scored by Naruyoshi Kikuchi) contrasts violently with the silent explosions of space, creating a sensory experience unlike any other mecha anime. Why avoid shady "free" sites
When looking for a "free" version, you might encounter both the 4-episode ONA (18-20 minutes each) and the December Sky movie (roughly 70 minutes). The movie is the superior entry point because: