Do you read? Ask your professor if you can compare books instead. Professors are remarkably willing to work with you if you make an effort to communicate with them. It sounds like they are trying to make the assignment achievable to everyone, and would likely offer other suggestions to get you going. Don't be shy about approaching them either after class or during office hours... Professors (or instructors) are always pleased when a student is engaged enough to care about the assignment.
I would avoid shows of a different era, tho... "the wonder years" was set in a different decade from which it was created, and thus is affected by the (then) current stereotype and political correctness. ie, it's the 60s but affected by the mid-80's. Stick to shows or movies that represent the timeframe in which they were created. Except for science fiction, which is purely speculative and colored by the relationships and interaction of the time it was created.
Hill Street Blues vs NYPD Blue (which has the added bonus of a specific character crossing decades), or LA Law vs Boston Legal, perhaps...... I would think that the portrayal (and treatment) of women in a legal office in the early 80s vs early/mid 00s would be interesting.
Hmmm.... you don't mention that you need to stay within one genre, but it would offer a lot more compare/contrast material to stick to a theme (cops, legal, family, singles, sci-fi).
(re sci-fi... did you know that the first interracial kiss on TV was on Star Trek? Pretty cool. Like, really interracial, not fake alien interracial-ness.)
Since you don't seem stuck within a specific or single genre, you can compare most anything that's of the appropriate timeframe. Questions to ask: Are they relegated to one stereotypical position (secretary, service), or do they hold positions of equality? Do authority figures treat them differently? what tone of voice is used to address each one? how are they portrayed physically? Emotionally? Are they respected? Are they appreciated? Are they acknowledged at all? Is their race/gender an "issue"?
I'd skip "Alien".... Ripley is a pretty progressive action herione for 1979, tho is still contrast-able to her character in later aliens movies.
imdb.com is a pretty good resource for movie information (actors, dates, summaries).
Sorry... I'm babbling. I kinda miss writing essays like this.