Greta Gerwig has debuted a first look at “Narnia: The Magician’s Nephew" that offers a full-hearted adaptation of C.S. Lewis’ allegorical adventure. Led Zeppelin’s “Stairway to Heaven” scores the trailer. Both were released online Tuesday. Gerwig unveiled the trailer at an IMAX event in New York where she discussed her “Barbie” follow-up with Stephen Colbert. Netflix is giving the film a wide theatrical release starting Feb. 12 and streaming available on April 2. It’s one of Netflix’s most ambitious films with its $280 million budget. Meryl Streep voicing the lion Aslan also sparks some debate. Gerwig describes the story as a spiritual quest.