“Van Helsing” season-opener, 10 p.m., Syfy. After four seasons in a near-future world, this goes back to the roots of vampire-hunting: It starts its final season with three episodes set in old Romania. This opener was beautifully directed by Jonathan Scarfe, a gifted actor (and son of Canadian star Sara Botsford) who later will return to his role as Axel. Jack (Nicole Munoz) has been flung into the past, told only to “kill the Dark One.” That’s not easy, amid castle schemes. “Great Performances: Beethoven in Beijing,” 9-10:30 p.m., PBS. When the “cultural revolution” raced through China in 1966, classical music collapsed. Violins were smashed, violinists were beaten; only six operas and two ballets — all of them praising the government — were approved. Then the Philadelphia Orchestra was somehow invited in 1973. Disputes would follow (including whether to do Beethoven’s Fifth), but it was a triumphant tour, shown via old film and current comments.