"Random Quest," based on a John ("Day of the Triffids") Wyndham science fiction parallel universes yarn, shows the BBC at its not-quite top- drawer. Here a so-so love story is made to trump an ingenious fictional study of Einsteinian paradoxes. One of the problems is the actor Sam West. His sluggish portrayal of the chief character is a nice demonstration of human entropy. He starts off so boring as to nearly vanish from the scene and winds up as one of those British vacuum cleaners marketed in infomercials, sucking most of the air and substance out of this romantic science fiction drama and turning it into a two-dimensional "Flatland." The rest of the cast performs adequately, but nobody seems to have really tried to make a difference. There is an attempt at an interesting walk-and-talk discussion of quantum mechanics, but that stops in mid-track. Much of the action takes place in a very modern home that sports a long and narrow basement swimming pool and a cramped closet-like bedroom. At first apparently quite striking, the home reveals itself to be an awkward space more like a very contemporary shop window than a house. If you're interested in how a talented cast and director can breathe life into a story about alternate realities, you only have to watch an episode of "Fringe." Otherwise, there's no parallel.