TV HIGHLIGHTS

Nature, 8 PM on Ch. 16 and Ch. 48:

Nature meets history in a journey that showcases the diverse wildlife of the North Atlantic in “Wild Way of the Vikings,” a new episode that follows the journey from Norway to Newfoundland that seafaring Nordic warriors made in 1000 A.D. The episode also reflects the deep cultural respect the Vikings had for creatures of both land and sea, from the reindeer herds of Norway and eider duck farms of Iceland to the puffins and otters along the coast of Scotland. Ewan McGregor narrates.

Big Brother: Celebrity Edition, 9 PM on Ch. 7 and Ch. 12:

Season 2 of this reality show spinoff may have been much shorter than its higher-profile CBS summertime sibling, but it managed to pack in its share of unexpected surprises almost from the get-go, as viewers saw Houseguest Anthony Scaramucci bail from the cast even before the first elimination episode. With a cast made up mostly of personalities who are — how to put this politely? — a bit past their sell-by dates, the competition for camera time occasionally got a little desperate. Tonight’s finale reveals the winner.

The Masked Singer, 9 PM on Ch. 19 and Ch. 45:

Surreal? Goofy? Addictive? However you choose to describe this, um, unique celebrity competition series, it enters a new phase of play as the remaining six singers merge for the first time into one big group in the new episode “All Together Now.” They’ll still continue performing anonymously and incognito for the often baffled judges, with guest panelist J.B. Smoove joining Ken Jeong, Jenny McCarthy, Nicole Scherzinger and Robin Thicke. Nick Cannon is the host.