What's the Kennection? #239

According to its full formal name, Tonga is the only nation in the Western Hemisphere to be what type of country?

In Marxist theory, the proletariat is, when compared to the bourgeoisie, the much larger what?

What does the 'O' stand for in the "Big O" notation used to classify computer algorithms?

Young Kristy McNichol won two Emmys for playing "Buddy" Lawrence on what 1970s TV drama?

What 1995 sci-fi movie starred both Natasha Henstridge and a young Michelle Williams as the alien predator Sil?

What's the "Kennection"?