One of the more interesting ways to introduce “alien” creatures into a science fiction world is to reveal that these apparent extraterrestrials are a lot more… terrestrial… than you’d think at first glance. Earth is an ancient planet, with 4.5 billion years checked off already, and that’s a tantalizing prospect for a writer. After all, who’s to say there wasn’t a civilization present for the early days of Earth, so long ago that no trace remains? There are a lot of human civilizations that have been lost to the ages as it is, so the thought of a nonhuman one disappearing isn’t exactly outlandish. From a scientific perspective, there are plenty of reasons to think there wasn’t one–no sign of resources having been extracted from the Earth prior to us, for example–but we can always fudge this for the sake of the story. That being said, here are four alien species who are a lot less alien than you might guess.

Spoiler warning–the reveal that these aliens are actually from Earth is sometimes a plot twist, so proceed with caution.

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We’ve talked about cameos a few times on here before. Cameos by celebrity fans are fairly common, and scientists are a great choice when you’re looking to lend your sci-fi some scientific credibility. However, there’s also the other side of the coin–when sci-fi characters drop out of their own universes and make cameos in shows where they wouldn’t usually belong. This isn’t just using the actor or referencing their famous role; we’ve actually got a pseudo-crossover on our hands. (The big difference between these cameos and crossovers is that these aren’t canon to their sci-fi origins.) Who does that? Let’s find out!

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Doing a TV show week to week… well, it can get a little dull. Emergency power to the deflectors, shields to 40%, yadda yadda. So sometimes, the actors like to get a little something to mix it up, and that can be fun for the writers and the audience as well. To see our favorite characters taken outside their typical milieu and placed in a situation where their usual tricks aren’t quite as useful can be quite telling about who they are (or it can be a complete disaster). I mean, that was the whole idea behind introducing the holodeck in Star Trek, after all. It made practically any setting a possibility. But not every show has a holodeck to fall back on when it comes time to do these types of episodes, so here are 4 episodes of sci-fi TV shows where the usual tropes of sci-fi took a week off, leaving us with a different genre all together.

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