Spoiler: 2/17/15 episode Chicago Fire "HEADLONG TOWARD DISASTER" 02/17/2015 (10:00PM - 11:00PM) (Tuesday) BODEN IS FORCED TO TAKE TIME AWAY AND HIS TEMPORARY REPLACEMENT QUICKLY FALLS OUT OF FAVOR WITH MEMBERS OF FIREHOUSE 51—Interim Chief Pat Pidgen (guest star Matthew Del Negro) is brought over to temporarily fill in for Boden (Eamonn Walker), who is left to tend to his personal affairs. When tension is sparked as the result of his derisive leadership, the absence of Chief Boden becomes all too apparent. Meanwhile, Lieutenant Severide (Taylor Kinney) must deal with a most unwelcome addition to his squad, Brett (Kara Killmer) gets closer to a girl she previously rescued and Casey (Jesse Spencer) starts seeing a new woman, Beth (guest star Bree Williamson), but interesting complications quickly unfold. Monica Raymund, Charlie Barnett, David Eigenberg, Yuri Sardarov, Joe Minoso and Christian Stolte star. Kenny Johnson, Melissa Ponzio and Randy Flagler guest star.