This film does not deserve the tepid and poor reviews given by the users of this site. The cast works so well in an ensemble in this movie that although you know the story is not possible, it is somewhat believable through the characters' performances. Lovitz is always excellent in movies, masterfully delivering comic relief when the audience needs it. Akyroid is always convincing as a scientist, and Bassinger - let us ignore for a moment she is intoxicatingly gorgeous in this movie, she does a stellar performance as the sexiest ET alive. This role was meant for Bassinger - she has that perfect balance between intelligence and innocence, and shows it on-screen.
Buffy fans, if you watch this film only to see Seth Green and Alyson Hannigan, you are only after a very small piece of the pie. Their scene together is very short but entertaining, and most definitely early evidence of their talents.
I'll say it again. Although the basis of this movie is unbelievable, the cast makes it as believable as possible with their seamless performances. They draw you into their world. Take this movie as it was meant to be taken: It is a fun comedy. Although it carries a PG Rating, adults and children will find it entertaining, and it is always refreshing to get a movie the whole family can watch.