"Smallville" (8 p.m., The CW): The lovely Lynda Carter, known far and wide as Wonder Woman, drops in another kind of superhero series as she guest stars on "Smallville." She plays Chloe's mom -- a

"Smallville" (8 p.m., The CW): The lovely Lynda Carter, known far and wide as Wonder Woman, drops in another kind of superhero series as she guest stars on "Smallville." She plays Chloe's mom -- a mysterious woman who has the power to control "meteor freaks"
"Grey's Anatomy" (9 p.m., ABC): We're not quite sure if we buy into this whole Izzie-and-George relationship on "Grey's Anatomy." But now it's she who is crying on his shoulder as she confronts a personal demon from her past.
"The 100 Biggest Weather Moments" (8 p.m., Weather Channel): Harry Connick Jr. whose home state of Louisiana was ravaged by Hurricane Katrina in 2005, hosts this five-part look at weather events that have had an effect on viewers' lives. The "moments" span six categories: technology; climate and environment; geopolitics; discoveries and firsts; sports and pop culture; and destructive forces. In addition to scientists and the Weather Channel's own personalities, other celebrities appear in the series, including Jennifer Garner, Laurie David, Danica Patrick, and Bill Cosby. The series airs Sunday through Thursday at 8 p.m.
"America at a Crossroads" (9 p.m., PBS): Tonight's episode, "Faith Without Fear/Struggle for the Soul of Islam: Inside Indonesia," examines whether the Islamic faith can be reconciled with individual freedom, and also Indonesia's long history of moderation in its practice of Islam. The series concludes Friday at 9:30 p.m.