In a title fight between teen/tween TV sensations, Victoria Justice (“Zoey 101”) guest stars on “iCarly” (7 p.m., Saturday, Nickelodeon). She portrays female championship fighter Shelby Marx, who challenges Carly to a bout after the girl journalist gets a little too inquisitive with the pugilist’s grandmother during a press conference.
I’m not so sure how the parents of “iCarly” fans will feel about seeing two girls punch each other in the face, but we’re told the proceeds will all go to charity.
Over on Disney, rival star Miley Cyrus co-stars with Cody Linley as Miley dates Ryan on a repeat “Hannah Montana” (7 p.m. Saturday, Disney).
To remind us of teen stars past, Lindsay Lohan portrays a set of scheming twins in the 1998 remake of “The Parent Trap” (8:30 p.m., Saturday, Disney). The G-rated entertainment continues with the 2003 animated comedy “Finding Nemo” (7 p.m. Saturday ABC), featuring the voices of Ellen DeGeneres and Albert Brooks.
• Live from San Antonio, “George Lopez: Tall, Dark & Chicano” (9 p.m. Saturday, HBO) offers a rich TV star’s reflections on life and family, children and wives and the onslaughts of age.
• The country-music competition “Can You Duet” (8 p.m. Saturday, CMT) comes down to its final foursome. JB Rocket, a tandem teamed up by the judges, takes on the Steel Magnolias, who entered the competition together. Lance Smith hosts and is joined by judges Naomi Judd, Big Kenny and producer Scott Borchetta.
• “Split Ends” (8 p.m. Saturday, Style) enters its fifth season. The series asks hair stylists with very different salons and clienteles to switch shops and lifestyles for some creative cutting.
• Fans of the orphaned series “Dirty Sexy Money” (9 p.m. Saturday, ABC) get closure of sorts as the series ends with Nick receiving new insights and his ex-wife penning a tell-all memoir of life with the Darlings.
• NBC executives must be ecstatic that “Sunday Night Football” (7 p.m. Sunday, NBC) is back. The ratings perennial joins “America’s Got Talent” as the only shows attracting large audiences to the Peacock network. Tonight: Buffalo meets Tennessee in the Hall of Fame game from Canton, Ohio.
• Ten summers ago, “Who Wants to be a Millionaire” (7 p.m. Sunday, ABC) rejuvenated a flagging ABC network. “Is that your final answer?” became a catchphrase, and a hundred bad “Millionaire” imitations were launched. Soon, programmers would increasingly opt for the cheap distraction of showing unpaid amateurs in contrived situations over the riskier proposition of airing scripted comedies and dramas starring trained actors. American television has not been the same since “Millionaire” arrived in the summer of 1999.
• Viewers who think of the suburbs as prison might enjoy “There Goes the Neighborhood” (8 p.m. Sunday, CBS). Eight families must live in an isolated neighborhood surrounded by a 20-foot wall. They also must do without modern conveniences, including electricity. One family will be voted out of the compound every week until one remains to win a $250,000 prize. Help yourself.
Cary Grant teams up with Myrna Loy in two gems, “The Bachelor and the Bobby-Soxer” (11:30 a.m. Sunday, TCM) and “Mr. Blandings Builds His Dream House” (1:15 p.m.), part of a 24-hour salute to Grant.