‘Empire’s‘ Jussie Smollett will guest star in WGN America’s critically acclaimed hit series “Underground,” marking the first time in 20 years that Smollett will appear in the same series as his younger sister Jurnee Smollett-Bell (Rosalee).

Smollett will play Josey, a wild-eyed runaway, in the upcoming episode, “Firefly,” premiering Wednesday, March 30 at 10:00 p.m. (ET/PT) on WGN America.

In the all-new fourth episode of “Underground,” John and Elizabeth Hawkes come face-to-face with Josey in a traumatic confrontation and test of wills. The Macons realize Noah and Rosalee are missing and enlist August Pullman to help find the runaways.

Meanwhile, Ernestine tries to cope with her daughter’s absence and the others debate whether they should run. Cato enacts a daring plan that has immediate repercussions on the plantation, while Pearly Mae makes an extremely difficult personal decision.

Here is your first look!