Here's the official guide of Chicago Fire episode 21 "Retaliation Hit". This episode airs on Wednesday, April 24th on NBC.
MISCONDUCT ACCUSATIONS LAND SEVERIDE IN HOT WATER, AS VOIGHT RETURNS —
TREAT WILLIAMS GUEST STARS—
- Accused of sexual misconduct by a former paramedic candidate, Severide (Taylor Kinney) faces potentially dire consequences and fights for his survival both within the Chicago Fire Department and the legal system.
- Detective Voight (guest star Jason Beghe) returns, looking to collect on the favor that Dawson (Monica Raymund) owes him for helping her brother, Antonio (guest star Jon Seda).
- Casey (Jesse Spencer) falls back into old patterns in his personal life, while Dawson, Herrmann (David Eigenberg) and Otis (Yuri Sadarov) become the proud owners of a real neighborhood bar as Molly’s prepares for its grand opening.