As announced, Jay Leno returns to host “The Tonight Show” (11:35 p.m., NBC, TV-14). Will all be forgiven, if not forgotten? His guests tonight include Jamie Foxx, Lindsey Vonn and Brad Paisley.
For all of the talk about Jay vs. Conan, the greatest damage done by the Leno experiment was to NBC’s prime-time lineup. How much was the success of “The Good Wife,” the growth of “The Mentalist” and the mere survival of “The Forgotten” due to the weak competition from NBC? And will viewers follow NBC’s late-night dramas when they return to their proper time? The experiment starts tonight with a double dose of “Law & Order” and continues Tuesday with the introduction of “Parenthood” at 10 p.m.