Suggested tagline for Gotham Season 3: ‘Rise of the Epic Love Triangle.’

The Fox drama has cast James Carpinello (The Good Wife, Person of Interest) to play the pivotal role of mob progeny Mario Falcone — and his first order of business appears to be whacking Jim (Ben McKenzie) and Lee’s (Morena Baccarin) romance.

The son of feared mob boss Carmine Falcone (John Doman), Carpinello’s Mario has rejected his family’s criminal ways and made a legitimate life for himself as a well-respected, Ivy League-educated ER doctor. He’s kind, honest and trustworthy, making him the black sheep of the Falcone clan. But — and here’s where the official character description gets interesting — his arrival in Gotham will create major waves in the personal life of Jim Gordon, who at the end of Season 2 left town to find and win back his fiancee Lee.

In addition to his stints on Good Wife and POI (which of course starred his real-life bride Amy Acker), Carpinello recurred on USA Network’s In Plain Sight and was a regular on Fox’s short-lived Mob Doctor.

Carpinello joins a growing a list of recurring Season 3 guest stars that also includes Once Upon a Time warrior Jamie Chung’s as Valerie Vale, Vicki’s Aunt and All My Children grad Maggie Geha as the new Poison Ivy. Casting, meanwhile, continues for the role of the Mad Hatter.

Gotham‘s third season is set to debut on Monday, Sept. 19 at 8/7.