What's the Kennection? #20

What Minnesota band was banned from Saturday Night Live in 1986 following a disastrous drunk performance of "Bastards of Young"?

What literary villain's archenemy is a Dutch professor named Abraham Van Helsing?

What name was shared by the first and last emperors of the Byzantine Empire?

What Catholic official, also called Promoter of the Faith, was charged with arguing against candidates for sainthood?

At sea, what quantity can be measured in units called knots?

What's the "Kennection"?