In case you’re still lost as to what the heck is going on, a Scientology Run is when people film themselves charging into a Church of Scientology building to see how far they can get before being caught and booted out. It’s a notoriously secretive religion, so it turns the whole place into an action-movie set piece where the protagonist is trying to infiltrate a compound while fending off its legion of foot soldiers, clad in terrifying white button-ups with black vests.
Pretty sure they don’t do missions. They’re all about recruiting people for money, not righteousness.
Jehovah’s Witness are another that’s big on missions and door-to-door converting. Maybe that’s what you’re thinking of?
Jehova’s Witness: “Hello, we’d like to talk to you about Jesus”.
Bernard Black: “Oh, I’d love to talk about Jesus! What’s he been up to lately?”