'The Conners': Matthew Broderick makes his debut as Jackie's love interest!

The Conners certainly know how to do Halloween right!

The iconic TV brood celebrated their favorite holiday during Tuesday's all-new episode -- the third of the spinoff show's new season following the cancellation of Roseanne and the firing of Roseanne Barr over racist tweets earlier this year -- with each family member going all out in their creative costumes.

The episode, entitled, “There Won’t Be Blood,” kicks off with the family -- minus Darlene (Sara Gilbert) -- entering a Halloween-themed Instagram contest with their epic outfits: Becky (Lecy Goranson) as Sharknade O’Connor, Dan (John Goodman) as Napoleon Blown-Apart, Harris (Emma Kenney) as Lizzie Boredom and more.

the conners halloween
ABC

Since Barr's departure, there have been some additions to The Conners cast, with the introduction of Darlene's new love interest, played by Justin Long, in last week's episode. This week, a second Conner woman was courting a new man, as Jackie (Laurie Metcalf) introduced the family to her new fellow, Peter, played by Matthew Broderick.

"Matthew was so great, so funny," Kenney told ET ahead of the episode. "I was dying watching him. [He] and Laurie have a great dynamic."

Peter, however, lacks much of Broderick's real-life charisma. He's unemployed, and a bit of a dullard, with a master's in medieval culture and a series of Halloween "fun facts" that are anything but. 

"There is this one line in the episode... where Aunt Jackie is asking Dan, 'What do you think about him, what do you think about him?'" Kenney recalled. "He's like, 'Well, I've only known him for a little bit, but I know a lot about him,' something like that. It is just so funny and that kind of sums it up."

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THE CONNERS - 'We Continue to Truck' - As Darlene grapples with a life-changing offer from Ben, an unexpected conversation with David turns her world even more upside down. Relationship problems lead Jackie to the bottom of the bottle at the last place she remembers being truly happy. Becky's hopes of a happily ever after with Emilio are jeopardized when Dan delivers alarming news, on the season finale of 'The Conners,' TUESDAY, JAN. 22 (8:00-8:31 p.m. EST), on The ABC Television Network. (Eric McCandless via Getty Images) LAURIE METCALF
THE CONNERS - 'We Continue to Truck' - As Darlene grapples with a life-changing offer from Ben, an unexpected conversation with David turns her world even more upside down. Relationship problems lead Jackie to the bottom of the bottle at the last place she remembers being truly happy. Becky's hopes of a happily ever after with Emilio are jeopardized when Dan delivers alarming news, on the season finale of 'The Conners,' TUESDAY, JAN. 22 (8:00-8:31 p.m. EST), on The ABC Television Network. (Eric McCandless via Getty Images) LECY GORANSON
THE CONNERS - 'We Continue to Truck' - As Darlene grapples with a life-changing offer from Ben, an unexpected conversation with David turns her world even more upside down. Relationship problems lead Jackie to the bottom of the bottle at the last place she remembers being truly happy. Becky's hopes of a happily ever after with Emilio are jeopardized when Dan delivers alarming news, on the season finale of 'The Conners,' TUESDAY, JAN. 22 (8:00-8:31 p.m. EST), on The ABC Television Network. (Eric McCandless via Getty Images) EMMA KENNEY
THE CONNERS - 'We Continue to Truck' - As Darlene grapples with a life-changing offer from Ben, an unexpected conversation with David turns her world even more upside down. Relationship problems lead Jackie to the bottom of the bottle at the last place she remembers being truly happy. Becky's hopes of a happily ever after with Emilio are jeopardized when Dan delivers alarming news, on the season finale of 'The Conners,' TUESDAY, JAN. 22 (8:00-8:31 p.m. EST), on The ABC Television Network. (Eric McCandless via Getty Images) RENE ROSADO, LECY GORANSON
THE CONNERS - 'We Continue to Truck' - As Darlene grapples with a life-changing offer from Ben, an unexpected conversation with David turns her world even more upside down. Relationship problems lead Jackie to the bottom of the bottle at the last place she remembers being truly happy. Becky's hopes of a happily ever after with Emilio are jeopardized when Dan delivers alarming news, on the season finale of 'The Conners,' TUESDAY, JAN. 22 (8:00-8:31 p.m. EST), on The ABC Television Network. (Eric McCandless via Getty Images) AMES MCNAMARA, EMMA KENNEY, MICHAEL FISHMAN, JAYDEN REY, SARA GILBERT
THE CONNERS - ABC's 'The Conners' stars Maya Lynne Robinson as Geena Williams-Conner, Jayden Rey as Mary, Michael Fishman as D.J. Conner, John Goodman as Dan Conner, Laurie Metcalf as Jackie Harris, Sara Gilbert as Darlene Conner, Emma Kenney as Harris Conner, Ames McNamara as Mark, and Lecy Goranson as Becky Conner. (Robert Trachtenberg/ABC via Getty Images)
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) JOHN GOODMAN, SARA GILBERT
THE CONNERS - 'Keep on Truckin' - In the premiere episode, 'Keep on Truckin,' a sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before. 'The Conners' premieres TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on ABC. (Eric McCandless/ABC via Getty Images) SARA GILBERT, LAURIE METCALF
THE CONNERS - 'Keep on Truckin' - In the premiere episode, 'Keep on Truckin,' a sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before. 'The Conners' premieres TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on ABC. (Eric McCandless/ABC via Getty Images) LAURIE METCALF, SARA GILBERT, LECY GORANSON, JOHN GOODMAN
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) JOHN GOODMAN
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) JOHN GOODMAN
THE CONNERS - 'Keep on Truckin' - In the premiere episode, 'Keep on Truckin,' a sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before. 'The Conners' premieres TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on ABC. (Eric McCandless/ABC via Getty Images) LECY GORANSON, SARA GILBERT
THE CONNERS - 'Keep on Truckin' - Actress Maya Lynne Robinson joins the cast of 'The Conners' as a series regular. (Eric McCandless via Getty Images) MICHAEL FISHMAN, MAYA LYNNE ROBINSON
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) ESTELLE PARSONS, SARA GILBERT, LAURE METCALF
THE CONNERS - 'Keep on Truckin' - In the premiere episode, 'Keep on Truckin,' a sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before. 'The Conners' premieres TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on ABC. (Eric McCandless/ABC via Getty Images) JOHN GOODMAN, AMES MCNAMARA
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) MARQUES RAY, JAMES PICKENS JR., JOHN GOODMAN
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) AMES MCNAMARA
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) LAURIE METCALF, JOHN GOODMAN
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) JOHN GOODMAN, NATALIE WEST, SARA GILBERT
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) LECY GORANSON, ESTELLE PARSONS
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) LECY GORANSON, SARA GILBERT, AMES MCNAMARA, ESTELLE PARSONS
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) AMES MCNAMARA, MAURICIA LARA, ASHTON JAMES PULIS, JOHN GOODMAN
THE CONNERS - ABC's 'The Conners' stars John Goodman as Dan Conner. (Robert Trachtenberg/ABC via Getty Images)
THE CONNERS - ABC's 'The Conners' stars Sara Gilbert as Darlene Conner. (Robert Trachtenberg/ABC via Getty Images)
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) NATALIE WEST, MAYA LYNNE ROBINSON
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) JOHN GOODMAN, SARA GILBERT
THE CONNERS - ABC's 'The Conners' stars Jayden Rey as Mary. (Robert Trachtenberg/ABC via Getty Images)
THE CONNERS - ABC's 'The Conners' stars Laurie Metcalf as Jackie Harris. (Robert Trachtenberg/ABC via Getty Images)
THE CONNERS - ABC's 'The Conners' stars Ames McNamara as Mark. (Robert Trachtenberg/ABC via Getty Images)
THE CONNERS - ABC's 'The Conners' stars Maya Lynne Robinson as Geena Williams-Conner. (Robert Trachtenberg/ABC via Getty Images)
THE CONNERS - ABC's 'The Conners' stars Michael Fishman as D.J. Conner. (Robert Trachtenberg/ABC via Getty Images)
THE CONNERS - ABC's 'The Conners' stars Emma Kenney as Harris Conner. (Craig Sjodin/ABC via Getty Images)
THE CONNERS - 'Keep on Truckin'' - A sudden turn of events forces the Conners to face the daily struggles of life in Lanford in a way they never have before, on the series premiere of 'The Conners,' airing TUESDAY, OCT. 16 (8:00-8:31 p.m. EDT), on The ABC Television Network. (Eric McCandless/ABC via Getty Images) AMES MCNAMARA, JOHN GOODMAN
THE CONNERS - ABC's 'The Conners' stars Lecy Goranson as Becky Conner. (Robert Trachtenberg/ABC via Getty Images)
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The actress also praised Broderick as a "trooper," for making his debut during the Halloween show, and spending hours in the makeup chair for the prosthetics necessary to play Peter's head-scratching costume: Descartes' theory of mind-body dualism.

"Matthew's costume is this philosophical mind game, I don't know how to describe it at all," Kenney laughed. "But it was really cool to look at and watch him get done in the makeup trailer... He was there for a long time, he was a trooper."

One person who was left in the dark about Broderick's role on The Conners, however, was the actor's real-life wife, Sarah Jessica Parker!

"He didn't tell me that part," Parker hilariously revealed to ET's Nischelle Turner on Monday, when she discovered her hubby was playing Jackie's love interest. "He told me he got to work with Laurie Metcalf. He loves Laurie Metcalf. We all love Laurie Metcalf... But we don't talk about work much."

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