What to Watch: Thurs, October 18

The Nature of Things (New Season)
8 p.m., CBC
In the premiere episode of the show’s 52nd season, David Suzuki looks at the historic conflict that exists between wolves and buffalo in Wood Buffalo National Park in Alberta, home to the largest free-roaming buffalo herd in the entire world.

Covert Affairs
7 p.m. & 10 p.m., Showcase
When a Canadian couple go missing in Barcelona while attempting to pick up a computer virus from someone known as Red Rover, Annie and Auggie go undercover in order to complete the mission.

30 Rock
8 p.m., Citytv & NBC
When Tracy tweets an offensive remark saying that women aren’t funny, Liz pulls out all the stops to prove him wrong. Meanwhile, Liz must try to prevent Jenna from having a meltdown after she receives some negative press.

Two and a Half Men
8:31 p.m., CTV & CBS
When an old friend’s daughter (former Hannah Montana star Miley Cyrus) shows up for a visit, Walden suddenly feels old.

The Office
9 p.m., Global & NBC
When Jim convinces Dwight that the building is unsafe, Dwight rents a bus and sets up the office inside it. Meanwhile, Nellie asks for Andy’s help in adopting a baby and Jim tries to make Pam happy with pie.

Undercover Boss Canada
9 p.m., W
Having to move house is one of the most stressful times in a person’s life, and Premiere Van Lines vice-president Kirsten Flynn is about to see that for herself when she works up a sweat loading trucks during a heat wave to see how her employees handle it.

Mountain Men (Season Finale)
10 p.m. & 1 a.m., History
This series about determined men living off the grid in the great outdoors ends its first season as Eustace takes a final stand to save his land and Tom fights off a bear that threatens the lives of his family.

Elementary
10:01 p.m., Global & CBS
Sherlock and Watson work to track down a serial child abductor, nicknamed Balloon Man for his eerie signature of leaving balloons at the scene of each of his crimes.