I am – Hercules!! The second-quarter (April through June) ratings for “The Tonight Show With Jay Leno” have hit their lowest level since 1993, the year CBS launched “The Late Show With David Letterman.” Two weeks ago Letterman and Leno tied in the 18-49 demo for the first time since Leno returned to “Tonight” earlier this year. In addition, the first 17 weeks of 2010’s “The Tonight Show With Jay Leno” averages in 18-49 well below the first 17 weeks of 2009’s “The Tonight Show With Conan O’Brien.” (Leno isn’t likely to ever catch up to the 35-week complete-series average for O’Brien’s “Tonight,” which saw its ratings skyrocket when viewers learned he was leaving the show.) Meanwhile, while Leno continues to narrowly beat Letterman most weeks, the return of Leno to “Tonight” apparently hasn’t diminished Letterman’s 18-49 scores. From Deadline Hollywood:

The Late Show is now tracking at demo levels comparable to where Letterman was before O'Brien was replaced. Late Show drew 3.3 million viewers and a 0.9/4 in 18-49, down 7% in viewers and even in 18-49. It was Late Show’s most competitive 2Q position against The Tonight Show in viewers (-746,000) and adults 18-49 (-0.2) since 1995.

The only shows showing second-quarter 18-49 increases at that hour are "Nightline" and "Jimmy Kimmel Live." "Kimmel" was up 10 percent from the same period in 2009. In 18-49, "Late Night With Jimmy Fallon" was slightly ahead of "The Late Late Show With Craig Ferguson," though "Ferguson" was slightly ahead in total viewers. Find all of Deadline’s story on the matter here. Find TV By The Numbers story on the matter here. Follow Herc on Twitter!! Follow Evil Herc on Twitter!!