3rd Rock from the Sun plot
Four aliens are disguised as ordinary people to study the behavior of the inhabitants. These aliens have taken on the guises of the Solomon family consisting of Dr. Dick Solomon, his sister Sally, his brother Harry and his son Tommy. They mingle with the people. High Commander Dick does this by teaching at a university. Here he meets Dr Mary Albright, a woman he instantly falls for, but unfortunately for him, her feelings aren't always mutual.