Feel free to drop any links, preferably with a short description and a selling point!

The Last Man On Earth
https://www.youtube.com/watch?v=bXjDW0ggg_A
1964
Vincent Price at his most humorless, but also at his most haunted.  And the first adaptation of the classic book "I am Legend".  Also, it pre-dates Night of the Living Dead, but boasts a ton of the same basic elements that made NOTLD a hit.

Tobor The Great
https://www.youtube.com/watch?v=6EUwV1bugGQ&t=2459s
1954
Super kid friendly Sci-Fi.  The tone reminds me a lot of Japanese kiddy sci-fi flicks, with a loveable robot that gets a decent amount of screentime. If the human characters are not terribly memorable, they are at least likeable enough.  Except for the genius kid.  But hey, we gotta have something to complain about for movie night to be complete!
Also, made by Republic, which to this day is ranked as among the best producers of movie serials.  This isn't a serial, but it does share its formula of keeping intersting things happening without allowing dull moments to build up. Or at least, that was my feeling while watching

The House on Haunted Hill
https://www.youtube.com/watch?v=PjTbzrXE9u0
1959
Vincent Price is gonna be showing up a lot on this list.  What we have here is some fine and fragrant fancy ripe cheese! Directed by William Castle, the biggest rival for B-Movie king that Roger Corman ever faced.  A bored rich couple set up their house to become a horror show and invite people to stay over as a challenge.  But there is more to this little contest than they let on.

The Comedy of Terrors
https://www.youtube.com/watch?v=ANSaqkscG5E
1963
Vincent Price and Peter Lorre.  Directed by Roger Corman.  Nuff said.

Saturn 3
https://www.youtube.com/watch?v=gk5tLK22f70
1980
No idea what it's about, but it stars Sarah Fawcett, Kirk Douglas, and a ton of fancy spaceship control panels.  Also, it's got a 10% rating on Rotten Tomatoes.  So you know it's good!