I'm a little more intrigued that Marty is a two time returned. Makes it more interesting. Wish he could've met his parents, though. We'll see where they're going with this.
The grandmother is evil. There's much more to this and the young 'grandpa' they showed at the end on the investor will be interesting. Need to find out more about what happened in the 1930s when they kept killing folks.
Also, wonder if any of the disappeared can come back at all. hinting no, but we'll see.