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FIRST LOOK

Tracker: Manifest’s Melissa Roxburgh Cast as Colter’s Sister Dory — Get Airdate and Scoop on Family Reunion

Colter Shaw can cross “finding Dory” off his to-do list.

CBSTracker has enlisted Manifest vet Melissa Roxburgh to play Colter Shaw’s sister Dory. The casting was first confirmed by Colter himself, Justin Hartley, who shared a photo with his new TV sister on Instagram Monday.

“Colter finally reunites with his little sister Dory in the coming weeks,” Hartley revealed. “Join me in welcoming the lovely and talented @MRoxburgh to the @TrackerCBS family!”

TVLine can now confirm that Roxburgh will guest-star on Sunday, May 5 (CBS, 9/8c), in an episode titled “Beyond the Campus Walls.” The official synopsis for the hour reads as follows:

When a grad student goes missing after a house party, his friends and family believe he buckled under the pressure of his research grant. But, after consulting with his sister Dr. Dory Shaw (Melissa Roxburgh)— a professor at the school — Colter discovers a trail of explicit photos and messages that lead him to uncover a dangerous (and deadly) conspiracy on campus.

CBS
Sergei Bachlakov/CBS

Tracker’s Feb. 11 premiere introduced This Is Us vet Hartley as Colter Shaw, a lone-wolf survivalist who roams the country and uses his expert tracking skills to help private citizens and law enforcement solve all manner of mysteries… all while contending with his own fractured family. 

That’s where things got interesting.

Flashbacks revealed that Colter and his siblings — which include an older brother, Russell, and a younger sister, Dory — had an unusual upbringing. Their parents, Ashton and Mary (played by Oz’s Lee Tergesen and Good Sam’s Wendy Crewson), “were professors at Berkeley until there was this incident with my dad,” Colter explained. “So, he took us to live off the grid at this cabin. It was a compound, actually, by Sierra National Forest,” where Ashton “started to talk about these people that were out to get him and how we all had to be prepared. He taught us how to track, how to hunt, and he taught us to free climb at this place called Devil’s Notch.”

One night in 2003, when Mary wasn’t home, Ashton’s paranoia got the best of him and he made a run for it, leaving his three children behind. Russell went after him, and an hour later, Colter found his father, dead, at the bottom of Devil’s Notch. It appeared as though he’d been pushed by Russell. 

In the present day, Russell has attempted to make contact with Colter. There’s supposedly something Colter “needs to know.” However, Mary — who has not been seen since Episode 2 — wanted Colter to disregard his brother’s pleas. (Update: Jensen Ackles has been cast as present-day Russell and will first appear in the May 12 episode.)

Up until now, there’d been no mention of Dory in the present day timeline.

“We have to address that,” Hartley told TVLine in February. “When it happens, it will be very meaningful… [but] you won’t see her early in Season 1. I can tell you that.”

Watch a promo for Roxburgh’s debut below:

Tracker was previously renewed for Season 2. New episodes air Sundays at 9/8c on CBS (and stream next day on Paramount+); its Season 1 finale airs May 19.

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