Teen Nick's '90s block is a big hit

Anyone know about this Teen Nick '90s block that's been running overnight since (I think) Monday?

If you know any teenagers, you very well may because this has suddenly become the hottest thing on TV.

I exaggerate, but only slightly. Seriously, it's wildly — improbably — successful.

"The '90s are All That 12 a.m. to 2 a.m." Monday's block was seen by 555,000 kids — more that 100 percent higher than the same time last year. The shows, continuing all week, are "Kenan and Kel;" "All That," "Doug" and "Clarissa Explains it All."