Some relationships evolve for better or for worse in the upcoming episode of "Gotham" season 4. Last week's episode introduced one of the creepiest villains in Batman's rogues' gallery and this week, the arc continues.

The title of episode 7 of "Gotham" season 4 is titled "A Day in the Narrows." Professor Pyg (Michael Cerveris) continues to terrorize Gotham, most especially its police officers that comply with Penguin's (Robin Lord Taylor) crime licensing system. Jim Gordon (Ben McKenzie) and Harvey Bullock (Donal Logue) go to the Narrows to look for clues.

Bruce Wayne (David Mazouz) was off-screen for last week's episode, but in this upcoming installment, fans and viewers will get to see him again. Bruce will meet an old friend of his named Grace (Samia Finnerty), who will get him to go on a night out with some old classmates, among them being a certain Tommy Elliot a.k.a. the future Batman villain named Hush, played by Gordon Winarick.

Meanwhile, Sofia Falcone's (Crystal Reed) relationships with both Penguin and Jim will continue to evolve. Fans and viewers know that Sofia and Jim conspired to take Penguin down from his throne as the king of the city's criminal underworld. However, from her interactions with both characters, it seems like she has the two of them in the palm of her hand.

Fans and viewers have noticed that Ivy a.k.a. the future Poison Ivy was nowhere to be seen after the first few episodes of the fourth season. She was last seen downing so many bottles of potions from an herbal doctor after having had enough of being disrespected not just by Penguin, but even by Tabitha (Jessica Lucas).

When the character comes back in the second half of the season in 2018, Ivy will go through another change. This new form of the future rogue is being recast, with "The Flash" series and "Tomorrow People" star Peyton List taking on the more dangerous version of the character.

Ivy Pepper a.k.a. Poison Ivy was originally played by Clare Foley, bringing in a much younger version of the character who served to be one of Selina Kyle's (Camren Bicondova) best friends. It was an encounter with an Indian Hill escapee that caused the character to age, with Maggie Geha portraying the older version.

The show's producers revealed that Ivy's transformation from drinking those bottles of potions will have her taking another step towards the villain that she is known to be in the comics. The Ivy that fans will see will become more dangerous and is described as a "live wire of crazy energy." Ivy's goal moving forward will be on making the mad city her green paradise.

"Gotham" season 4 airs Thursdays at 8 p.m. EDT on FOX.