A lot of things can test a marriage, but Lorenzo and Susan Vega unwittingly put their five-year union to the ultimate test: They go camping. And Susan's guardian angel, seen only by Susan, joins them.TV's I Love Lucy was in its fifth season when this romp gave fans more reasons to love its stars. Desi Arnaz plays Lorenzo, who heads for wide-open spaces to test his chemical company's new product. Wife Susan (Lucille Ball) goes too. And soon we're all headed for comedy chaos built on tent-raising, forest critters, inflatable rafts and other typical elements of roughing it. There's one atypical element: the angel (James Mason) who wants to rescue their troubled union. Marriages may be made in heaven. But the details are worked out here below.