Xtro, the original movie, was a British production involving an abducted father who comes back for his son, transforming him into an alien like himself and raising Hell for his ex-wife and friends.
This movie has nothing even resembling anything like that, with the exception of the director.
It is a bad sign when a movie sequel manages to forget some of what happened in the previous movie. It is a terrible sign when it completely ignores every thing like the plot, characters, situations, et al.
Even worse is when you hire Jan Michael Vincent at the height of his addiction phase, when he was on the verge of getting bounced from Airwolf for his drunken antics. His underwhelming presence in this film is a great display of the depths he had sunken to already.