The Ghostbusters' increasing notoriety is throwing them for a loop. While Trevor steadies himself by trying to plan a "friendiversary" celebration for him and Lucky, Phoebe meets someone who might be a real friend instead of just a social media follower. But friendships new and old have to take a back seat to more immediate concerns when a ghostly saber summons the ghost of Captain Kidd and threatens to transform NYC into a ghostly pirate town!