PSST. The biggest trick-or-treat this Halloween is likely to be Jerry Seinfeld performing new stand-up material on David Letterman's Late Show.

Seinfeld is booked to appear on Oct. 31, and perform for the first time on TV in more than a year. 

That is the first night of the November sweeps, the crucial ratings period that networks use to set ad rates. 

Jerry's last TV performance was also on Letterman in March 2001, when he performed about five minutes of new material. 

Seinfeld's spokeswoman confirmed that the comedian is booked on Letterman's show but cautioned that the date could change. He's also scheduled to appear on The Tonight Show with Jay Leno on Oct. 10, but is not expected to perform. 

Both appearances are part of Seinfeld's return to stand-up and tied to his new movie, Comedian, a warts-and-all documentary that chronicles his return to the stage. 

The film opens next month. 

In his search for new material, the comic who made millions on a sitcom about nothing, has been seen roaming his home turf on the Upper West Side.

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