Two familiar faces will soon be checking into The Night Shift.

Under the Dome heroine Rachelle Lefevre and Rookie Blue alum Missy Peregrym have been cast in the Season 4 finale in potentially substantial roles, THR.com reports.

Lefevre will play military doctor Major Natasha Anthony, while Peregrym will portray Reagan, a paramedic who clashes with Drew. Both roles have the potential to recur if the medical drama is renewed for Season 5.

Peregrym recently booked a series regular role in Season 2 of Syfy’s Van Helsing, while ABC in May passed on Lefevre’s Doomsday pilot.

The Night Shift finale is set air on Thursday, Aug. 31 at 10/9c on NBC

Ready for more of today’s newsy nuggets? Well…

* MythBusters will return with new episodes and new hosts (Brian Louden and Jon Lung), on a familiar home (Science Channel), on Wednesday, Nov. 15 at 9 pm.

* Malcolm-Jamal Warner (The Cosby Show), Tatyana Ali (The Fresh Prince of Bel-Air) and Christian Antidormi (Spartacus: War of the Damned) have been cast as series regulars in USA Network’s upcoming crime-dramedy Olive Forever, our sister site Deadline reports. The series follows a teenage con artist who starts over in a new town/school/foster home.

* TVLine has learned that Sibongile Mlambo (Black Sails) has joined the cast of Freeform’s supernatural drama Siren, playing Donna, a mermaid described as “mystifying and deceptively powerful.”

* Ann Curry will host the new PBS docuseries We’ll Meet Again, our sister site Variety reports. The six-part series facilitates reunions between people who have been affected by major events such as World War II or 9/11, and is set to air in 2018.

Which of today’s TVLine Items piques your interest?