How did Carl Reiner manage an Emmy nomination for a role he created more than 30 years ago? Check out tonight's "Mad About You" rerun, which salutes one of TV's funniest shows ever.
* "Mad About You" (8 p.m.-8:30 p.m., WBAL, Channel 11) -- Last season's cleverest single episode returns with Carl Reiner guest starring as Alan Brady. Remember? That's the fictional character he played on "The Dick Van Dyke Show" (1961-1966), and this episode imagines Brady was real, as Paul (Paul Reiser) asks the aging "star" to do a documentary on the history of TV. Mr. Reiner is up for Outstanding Guest Actor in a Comedy for the guest spot. NBC.
* "Kansas" (8 p.m.-9:30 p.m., WMAR, Channel 2) -- Patricia Wettig and Jenny Robertson star in this TV movie, made in 1994 as a pilot. Ms. Wettig, who is in the fall series "Courtroom" on CBS, plays a businesswoman returning to her rural hometown to care for her father. ABC.
* "Peter Jennings Reporting" (9:30 p.m.-11 p.m., WMAR, Channel 2) -- Japan's NHK network provides archival footage for "Hiroshima: Why the Bomb Was Dropped," the first of several documentaries timed to the 50th anniversary of the first wartime use of an A-bomb (Aug. 6). "Historians have never really resolved in their own collective minds whether or not Hiroshima really was necessary," the network anchor says. ABC.
* "P.O.V.: Dealers Among Dealers" (11 p.m.-12:30 a.m., MPT, Channels 22, 67) -- In the final installment of the summer PBS series highlighting independent filmmakers, producer Gaylen Ross profiles the friendly commerce of New York's gem trade, in which Jewish dealers seal huge transactions with a handshake. How huge? We see the flawless 89-carat diamond "Guinea Star," which was purchased uncut for $10.5 million and is expected to sell for $15 million to $18 million when finished. PBS.
* "VH1's Hot List" (7:30 p.m.-8 p.m., VH1) -- In an interesting new form of interactive TV, the music video network premieres a weekly show that promises to keep viewers up-to-date on music releases and TV programming with musical elements. A fax and e-mail service will give viewers instant backup information -- including album commentary.
* "The China Syndrome" (9 p.m.-11:45 p.m., TNT) -- This film with Jack Lemmon, Jane Fonda and Michael Douglas had an extraordinary Baltimore impact, for its 1979 release coincided eerily with the Three Mile Island nuclear power plant accident in nearby Middletown, Pa. The film builds high-voltage tension as it tracks the efforts of a loyal employee (Lemmon) to prevent a meltdown at a California power plant.