Thank you. I would even argue that Return of the Jedi wasn’t great either. I mean sure, it was beautiful and the Moon of Endor with its giant trees looked amazing, but the plot was mostly a rehash of the original (another Death Star? Really?) plus silly Ewok shenanigans that made the empire into a total joke.
That or the alien will simply scour all life from the planet and then strip mine it for resources. They don’t even have to be more intelligent than us. Suppose they were roughly equivalent to human intelligence but had an insect-like eusocial behaviour with a billion year old culture. They could be far more advanced than us simply due to the availability of time.