I Married A Monster From Outer Space some might say is a cheesy SF movie (and it is for the most part). It's one of the first SF/horror films and alien invasion films I ever remember seeing. It was a double bill playing along with the Steve McQueen movie, The Blob. They both gave me many nights of nightmares, which at the time distress me (and my parents) to no end. They pretty much laid down the law of seeing no more scary movies afterwards. But for whatever reason since I reached adulthood both movies still hold a place in my memory as classic or impactful.
I've also been watching some of the old Dr. Who series, and the new Dr. Who series has started up as well with its new season on BBC America. I prefer the older series however. I do enjoy the new doctor, Peter Capaldi, but I still find something missing with these newer doctor reboots that started with Christopher Eccleston and Billie Piper. If you are a fan that great, I'm just saying they're not as good to me as the older ones. That's not to say I won't watch some of them, and it's not to say that some of them haven't been pretty good like the episode Blink, but for the most part, they're not my cup of tea. Either way, whether new or older series, I think if you're a SF fan there's enough to be enjoyed. Having said that I have not seen a lot of the older series, and I'm still working my way thru them, and I have to say it's been a lot of fun.
The last ones I watched were The Caves of Androzani with Peter Davison, Vengeance on Varos with Colin Baker, and Nightmare of Eden with Tom Baker. They were all a lot of fun, and I look forward into watching more.
Here's a link to the movie, I Married A Monster From Outer Space on Youtube if you're interested.