The ad campaign for 'Paranormal Activity 4' has been assuring us that "All the activity has led to this," which can only mean that this is the final installment of the franchise, no matter how much money it makes... Ha, just kidding. The activity will probably continue to lead us through several more sequels, we're sure.

In any event, the latest TV spot for 'Paranormal Activity 4' introduces us -- sort of -- to Robbie, a creepy young fellow whose presence brings about some supernatural occurrences for his new neighbors. Check it out after the break.

If you're wondering who "Robbie" really is (spoiler alert!), he's actually Hunter, the baby who was abducted in 'Paranormal Activity 2' by his possessed aunt, Katie. The duo have moved into a nice neighborhood, presumably looking for a fresh start and souls to claim for their demonic master... or something. Honestly, after several entries, it's still anybody's guess what this series is really about. (And, according to our review of the workprint shown at Fantastic Fest, part 4 only piles on the questions.)

But it's the spooks and jolts that truly count, and the 'Paranormal' movies provide both. Check out the new preview below and lead yourself through more activity when the film hits theaters on October 19.