The Flash, Arrow, and Supergirl. Comic book worlds collide once again in the CW’s latest superhero crossover stunt, “Elseworlds.” 8 p.m. Sunday, Dec. 9, Monday, Dec. 10, and Tuesday, Dec. 11.
12th annual CNN Heroes: An All-Star Tribute. Anderson Cooper and South Jersey’s Kelly Ripa cohost the live ceremony honoring 10 people who are helping others and naming one of them the network’s 2018 Hero of the Year. Lenny Kravitz will perform, and presenters include Will Ferrell, Danai Gurira (Black Panther), Ted Danson, Mary Steenburgen, Omari Hardwick, Uzo Aduba, and others. 8 p.m. Sunday, Dec. 9, CNN.
Counterpart. Oscar-winner J.K. Simmons (Whiplash) returns in the dual roles of Howard Silk, a mild-mannered bureaucrat who, in a parallel universe, is a ruthless spy. After the first season’s finale left them trapped in each other’s worlds, each must cope with his new circumstances and the repercussions of a terrorist attack. 9 p.m. Sunday, Dec. 9, Starz.
Paris to Pittsburgh. Rachel Brosnahan (The Marvelous Mrs. Maisel) narrates a documentary looking at ways local and state governments and businesses are working to fight climate change, despite President Trump’s decision to pull the U.S. out of the Paris climate accord because, as he put it, “I was elected to represent the citizens of Pittsburgh, not Paris.” Among those making the argument that fighting climate change with alternative energy sources can be good for the economy is Pittsburgh Mayor Bill Peduto. 9 p.m. Wednesday, Dec. 12, National Geographic Channel.
Chilling Adventures of Sabrina: A Midwinter’s Tale. A new run of episodes about the teenage witch (Kiernan Shipka) is due April 5, but in the meantime, here’s a particularly chilling “winter solstice” episode to tide fans over. Friday, Dec. 14, Netflix.