Episodes and structure: The series had multiple seasons. I think there were two seasons? Wait, let me check. The first season aired in 2014 with 20 episodes, and the second season in 2017 with another set. Also, there was a movie called "Sonic Boom: Sonic's Rival" that might be a finale. The total number of episodes would be around 35 total. Including this gives the viewer an idea of how much content is available.
Characters: I need to list the main characters and maybe their Vietnamese voice actors if that information is available. But since I don't have that data, I can mention that the Vietnamese subtitles would make the characters' dialogue accessible without needing voice overs.
Next, the vietsub aspect. Where can viewers access Vietnamese subtitles? Probably on streaming platforms. Since it originally aired on Netflix, checking if Netflix Vietnam offers the Vietnamese subtitles. Also, other platforms like YouTube or Viu might have it. I should mention where to watch, but also consider that availability might vary by region.
