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Mighty Max micro playsets were some of the most popular toys of the early-to-mid 1990s, which of course resulted in plenty of rip-offs. One of the coolest releases that took advantage of the Mighty Max concept was a small line from 1996 titled Mysteries of the Universe, which consisted of three different compact UFOs that fit in the palm of your hand and contained micro visitors from outer space.
These were manufactured by Uni-King Toys of China, and I believe distributed mainly to discount stores. That's where I remember getting mine--probably for a couple bucks.
There's a black ship, a green ship and a blue ship, each with a different design and each including different micro aliens and other accessories. To add to the coolness, all of the sets include items found on Earth that have been associated with extraterrestrials, such as pyramids, a Moai, a Dogū, and Nazca Lines.