Season transition abounds. Tonight, viewers get to choose between the two-hour finale of “More to Love” (7 p.m., Fox), a plus-sized riff on “The Bachelor,” and “The Biggest Loser” (7 p.m., NBC), the competitive weight-loss series that has devoured a huge proportion of NBC’s non-Leno prime-time schedule.

Help yourself. But watch the portions.

Meanwhile, over on CBS, the claustrophobia concludes as Julie Chen hosts the two-hour “Big Brother” (8 p.m., CBS) finale.

“Shaq Vs.” (8 p.m., ABC) also wraps up its season with guest star Michael Phelps.

• CNBC continues its glance back at last September’s financial tsunami with “1 Year Later: Road to Recovery” (7 p.m., CNBC), an examination of the parts of the economy most affected by the crash of 2008 and where today’s investors may find the greatest areas of improvement and growth.

For another look at changed financial circumstances, don’t miss “Retirement Revolution” (8 p.m., PBS, check local listings), a glance at changes in retirement planning wrought by the gutting of many 401(k) and other plans.

• “Real Sports with Bryant Gumbel” (9 p.m., HBO) examines the impact of the advertising economy and long-term media trends on newspaper sports pages. Longtime sportswriter Frank Deford looks at the exodus of notable writers from some prestige sports sections and contemplates the future of sports coverage.

Other stories include the epidemic of concussions among high school football players, the uneasy relationship between black athletes and competitive swimming, and an updated 2007 story on dogfighting.

• “Ruby & the Rockets” (7:30 p.m., Family) presents a prime-time reunion of Shirley Jones and David Cassidy. The “Partridge Family” matriarch appears here as David and Patrick’s mother, Shirley, visiting from Pittsburgh.

• “Explorer: Sex, Lies and Gender” (9 p.m., National Geographic) recounts stories of infants born without clear gender identity and decisions made by parents that have resulted in decades of pain, misgivings and confusion. Among those profiled is a Desert Storm veteran whose doctors discovered from an MRI that he had two ovaries and a uterus.

• With a weeklong guest list that includes Jerry Seinfeld, Tom Cruise (tonight), Robin Williams, Halle Berry, Eric Clapton and Drew Barrymore, “The Jay Leno Show” (9 p.m., NBC) seems ready to party like it’s 1998.

Tonight’s other highlights

• Rumer Willis guest stars on “90210” (7 p.m., CW).

• Sad news about Myka’s father complicates a mission on “Warehouse 13” (8 p.m., SyFy).

• Jax’s freelance decision-making roils the waters on “Sons of Anarchy” (9 p.m., FX).

• “P.O.V.” (9 p.m., PBS, check local listings) presents “The Principal Story,” a profile of two educators at Illinois schools with very different methods.

Cult choice

A pre-“Beaver” Jerry Mathers stars with Shirley MacLaine and future “Dynasty” star John Forsythe in “The Trouble with Harry” (7 p.m., TCM), director Alfred Hitchcock’s whimsical 1958 tale about a body in the bushes.

Series notes

Showdown in Israel on “NCIS” (7 p.m., CBS) … Suspicion falls on every tenant on “Melrose Place” (8 p.m., CW).