The enduring popularity of ThunderCats (1985) can be attributed to:

One of the series' greatest strengths was its small but incredibly versatile voice cast. In the first season, just voiced nearly the entire cast.

"Downloading these episodes now is like seeing them in high definition for the first time," says one user on a popular retro-animation forum. "You realize the artistry. The way Lion-O’s Sword of Omens grows, the design of Mumm-Ra’s pyramid—it’s Gothic sci-fi. It holds up."

The year was 1985, but for Leo, it felt like the future had finally arrived in a beige plastic box. He sat in his wood-paneled bedroom, the glow of a Commodore 64 reflecting in his wide eyes. On the carpet lay a crumpled magazine with a bold headline:

Furthermore, the antagonist, Mumm-Ra, remains one of the most terrifying villains in cartoon history. His transformation from a withered corpse into a hulking demon is a visual feast that loses none of its impact nearly 40 years later.

You can buy the entire series in SD (Standard Definition) digitally. While not HD, these are pristine transfers from the original masters.