TONIGHT'S MIGHT-SEES

"Cold Case," 7 p.m., CBS. The best thing about this rerun is the music. Eight Bob Dylan songs sweep viewers back to the protest era. And the worst thing is the contrived plot, as people cling desperately to the secrets of their youth. The episode is OK; the music is superb.

"Robin Hood" season opener, 9 p.m., BBC America (Oceanic Digital Channel 341); preceded by a rerun at 8 p.m. The Sheriff of Nottingham, it turns out, has a sister. She's sly and scheming and dangerous. There are more woes for the overwhelmed outlaws. Guy of Gisbourne is furious that Marian hasn't married him; by the end of this hour, there will be a traitor in their midst. This is a fairly good hour, but continues a flaw in the show: Often, Robin and Marian face such imposing odds that there is no way to have a satisfying, believable victory.

OF NOTE

"The Mighty B" debut, 7:30 a.m., Nickelodeon. The heroine of this cartoon, Bessie, is age 9 and three-quarters and wonderfully obsessive. She obsesses on winning every merit badge in civilization; that leads to one story today, involving a dog show. She also obsesses on a giant roller-coaster. This may seem like any other cartoon, but Amy Poehler of "Saturday Night Live" stars and is one of the producers. The result has enough wit and zest to entertain kids or grown-ups.

"Harry Potter and the Goblet of Fire" (2005), 7 p.m., ABC. This fourth Harry Potter film centers on a perilous tournament. It added Mike Newell ("Four Weddings and a Funeral") as director and Ralph Fiennes as villain.

"Medium," 7 p.m., NBC. In this rerun, Allison's daughter Ariel has the key vision. She finds herself inside her mother's teenaged misadventure.

"Princess," 8 and 10 p.m., FAM. If you missed this movie's debut Sunday, here are some quick reruns. The settings are pretty; the story — a lonely princess, inside a modern city — is lame.

"Saturday Night Live," 10:29 p.m., NBC. This rerun has Christopher Walken, with music by Panic at the Disco.