Michael Schneider Variety Editor at LargeStop me if you think you’ve heard this one before: Benedict Cumberbatch guest stars as a moody 80s-era UK crooner who becomes Lisa’s imaginary friend on this Sunday’s episode of “The Simpsons.” Variety has a first look at this Fauxissey as he gives his take on the citizens of Springfield; scroll down to watch.In the episode “Panic on the Streets of Springfield,” Cumberbatch plays “Quilloughby,” described as Lisa’s “new imaginary friend — a depressed