Pioneer Village, based on the Hiwan Homestead Museum in Evergreen, Colorado, is a colonial recreation where dedicated workers act as their counterparts from 1864 and never break character. Mr. Garrison takes his class here for their field trip.
While the rest of the kids are bored in the village, a group of trigger-happy thieves arrive after being chased by police. Attempting to escape through a locked mine shaft at the rear of the village, the thieves start to interrogate the workers to find the code to the lock, but none of them will break character, not even to save their own lives.
Pioneer Paul, the village's spokesman, even shoots one of the townsfolk for breaking character in an attempt to save his own life. Finally, Stan Marsh manages to give the workers an in-character way to divulge the door code, 1864. Eric Cartman and Butters Stotch, trying to get back in after sneaking out, run into one of the thieves and he attacks them. The confusion allows the police to raid the camp, killing the robbers and catching the leader.
Finally a bell rings, signaling the end of the work day, and all of the village workers break character, revealing to everyone an efficient evacuation route through the stables and then head off to T.G.I. Friday's for some jalapeño poppers, to the shocked disbelief of the police and schoolchildren.