They Say You Should Follow

They say it looks like rain. They say a black cat is bad luck. They say you shouldn't go swimming right after you eat. But who are the "they" that made up all these rules? Marshall and Simon meet a lost old woman who needs their help: it's time for the annual Gathering of They, when They decide on all their sayings for the year. But somebody doesn't want They to meet. If the boys can't unravel this mystery and bring They together, nobody will know what They say about anything.