06/15/2013 (08:00PM - 09:00PM) (Saturday) : MILLS' DRIVE TO JOIN SQUAD CREATES FRICTION WITHIN THE FIREHOUSE - Mills (Charlie Barnett) finds himself the target of resentment from some colleagues when Severide (Taylor Kinney) supports his desire to join Squad. Tara (guest star Brooke Nevin), a paramedic candidate, joins Dawson (Monica Raymund) and Shay (Lauren German) on the job for a few shifts. Meanwhile, Shay comes to the aid of Cindy Herrmann (guest star Robyn Coffin), who suffers from pregnancy complications while her husband Christopher (David Eigenberg) is out of town. Elsewhere, Dawson and Casey (Jesse Spencer) draw closer as the grand opening of Molly's draws near, and Casey receives a surprise visit. Eamonn Walker also guest stars.