Legend S01 E07 The Gospel According to Legend

"He’s using gadgets & gizmos to tame the Wild West... once crazy adventure at a time."

Mordechai, a charlatan evangelist, arrives in Sheridan and bilks credulous farmers of their money and land by predicting the end of the world. So Pratt, impersonating his rakish character Nicodemus Legend, infiltrates the preacher's camp and with Bartok's help, stages an end of the world, bringing the preacher to true religion.