Ah, TV suburbia, where widows deal pot (''Weeds"), where residents chain up bad boys in their basements (''Desperate Housewives"), and now, on ''Big Love," where Sarah has three mommies.
Apparently, there's a sale on eccentricity at the mall.
But in ''Big Love," HBO's fine new series, polygamy is not played for laughs and ridicule. Creators Mark V. Olsen and Will Scheffer refuse to invite smirks at the expense of Mormon Bill Henrickson, his trio of wives, and their seven kids. The family's three conjoined homes near Salt Lake City are the setting for a richly ambiguous character drama about monogamy and faith. ''Big Love," which premieres Sunday at 10, is layered enough to do what HBO's ''The Sopranos" and ''Six Feet Under" have done so well: make atypical heroes knowable and universal. It pulls us into its parallel moral universe, rather than keep us standing outside in judgment.