Infinity Train is an animated sci-fi/fantasy anthology series with 4 seasons. It’s set on the eponymous vehicle that runs in a barren Mars-like environment; each car has its own self-contained, often-surreal miniature world.

Each season focuses on a different person (or group of people) who has been transported to the train and their efforts to find a way off, but also usually contains some characters from the previous season. Kate Mulgrew of Star Trek: Voyager fame plays a recurring character throughout the entire series.

Seasons 1 is still quite good but the most tween-oriented, while season 2 gets a bit darker but still maintains some of that focus. Season 3 is a beautiful dark tragedy. Season 4 is okay; it’s a prequel to the other seasons. It got rated TV-MA despite being much tamer than season 3; I’m guessing part of that is season 3 was nuts, but it’s also really suspicious that it got this rating when it is the one season where they vaguely hinted the protagonists were gay.

Unfortunately, it got canceled and disappeared from most places for a while as part of the Warner Bros suicide for tax purposes a few years back; now, S1, S2, and S4 can be bought, but piracy is still the only way to watch season 3. Luckily, the whole series has been on Internet Archive for ages, and no copyright claims have been made against it.