Bell grows frustrated when Conrad's dad and new chairman of the board requests Conrad's input in his discussions about hospital expenses; a sharp and sophisticated medical device representative tries to promote her costly products.
The surgeons are determined to shut down Quovadis after Henry Barnett almost loses his life due to a device malfunction; Bell, A.J. and Conrad work to save the life of Chastain's favorite custodian.
Conrad must diagnose a young woman who gets admitted after having extreme night terrors; Devon faces his first Halloween in the emergency room; Nic panics over her decision to bring her newly sober sister to Mina's epic annual Halloween party.
Using only an armrest, a curtain rod, and a toothpick, MacGyver must fix a sabotaged train in order to protect a whistleblower who has proof that her boss is selling weapons to U.S. enemies.