Firehouse 51 helps Herrmann put on a school fundraiser. Carver's troubled brother comes to town; a grateful citizen is determined to thank Brett and Severide for saving his life.

The prince of Canada and his wife try to find privacy and seclusion in a small mountain town.

Barry feels guilty for what happened to Caitlin and Mark comes up with a plan which makes everyone skeptical. Meanwhile, Red Death looms in Central City and commands that failure is not an option. Joe asks Cecile to make a choice which leads Cecile to think about the greater good. Allegra and Chester take a step in a new direction. Lastly, old friends pay an unexpected visit to S.T.A.R. Labs.

Jimmy gets help from the audience to decide what he should post on Twitter in an all-new WeTweet, then catches up with Liam Neeson and Jack Whitehall before welcoming musical guest Nate Smith.