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Aleksa Palladino and Mark O’Brien have joined the second season of AMC’s “Halt and Catch Fire” as a series regular and recurring character, respectively, the cabler announced Thursday.

Palladino (“Boardwalk Empire”) will play well-traveled and highly educated freelance journalist Sara Wheeler, who comes from a wealthy background, but is self-reliant and responsible. Due to past experiences, Sara is skeptical of relationships, but after reconnecting with Joe (Lee Pace), whom she first met back in college, the couple shares a real, deep connection.

O’Brien, who starred in the CBC’s series “The Republic of Doyle,” has been cast as Tom Rendon, an IT department head at a law firm who is an early adapter of Cameron’s (Mackenzie Davis) computer startup company, Mutiny, and shares her same brilliance and passion for gaming. His character is described as having a conservative exterior but a strong hacker ethos that may rival Cameron’s.

Season 2 of the computer-age period drama picks up over a year after the freshman finale left off, starting up in March 1985.

Earlier this year, showrunner Jonathan Lisco commented on changes to expect in the new episodes: “This season is going to be a bit more grounded and bit more contained. Those time jumps will be a little bit less befuddling…we’re certainly looking at pacing for season two.”

“Halt and Catch Fire” also stars Scoot McNairy, Kerry Bishé and Toby Huss.