Rebecca Rubin Film and Media ReporterNicolas Cage is back… not that he went anywhere.The actor’s latest movie “The Unbearable Weight of Massive Talent,” a meta comedy in which he plays a fictionalized version of himself, is one of several films opening nationwide over the weekend. It’ll compete against director Robert Eggers’ Viking epic “The Northman” and Universal and DreamWorks’ animated family film “The Bad Guys,” as well as last weekend’s champion “Fantastic Beasts: The Secrets of Dumbledore.”Unless ticket sales crash in week two, “The Secrets of Dumbledore,” the third chapter in the “Harry Potter” spinoff series, should retain the domestic box office crown.