The actual Pleiades.
RATIONALWIKI.COM
The cluster is very young, no more than 150 million years old. Any planets orbiting the stars of this cluster would also be equally young. In fact, when the Earth was 150 million years old, it was still in the Hadean eon, characterized by regular impacts from asteroids and comets. Its surface was largely molten due to the constant, relentless impacts. It would be another two billion years before oxygen first appeared in its atmosphere.
In other words, if space aliens did evolve on any of the (hypothetical) worlds in the Pleiades cluster, they'd be bacteria.
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