Chicago Fire 5×10 “The People We Meet” Season 5 Episode 10 Promo – Severide (Taylor Kinney) agrees to a bone marrow donation but a work accident throws everything into flux. Casey (Jesse Spencer) and Dawson (Monica Raymund) try to find harmony at home. Meanwhile, Otis (Yuri Sardarov) and Mouch (Christian Stolte) decide to film a PSA encouraging people to join the Chicago Fire Department but hit a creative wall in the process. Eamonn Walker, Kara Killmer, David Eigenberg, Miranda Rae Mayo and Joe Minoso also star. S. Epatha Merkerson and Jeff Hephner also guest star.