'Hey Arnold!' and 'Rocko's Modern Life' join the schedule starting Sept. 5 with back-to-back episodes from 12-1AM.

The shows join the regular line-up on Sept. 6 at 1AM and 1:30AM, replacing 'Clarissa Explains It All' and 'Doug' on Tuesdays and Thursdays.

You can also catch replays of these classic adventures of the yellow-haired city-dweller and the wallaby in a party shirt and his dog Spunky at 2-4AM.

Since adding the new nostalgia-themed programming, TeenNick has seen a double-digit increase in viewership in their late-night programming.

'Rocko' premiered in 1993 and ran until 1997. 'Arnold' is a bit younger, having premiered in in 1996 and airing until 2004.

Fellow classic NickToons 'Doug,' 'Rugrats' and 'Ren & Stimpy' recently turned 20! We celebrated their big anniversaries here.

Are you happy 'Rock' and 'Hey Arnold' are joining TeenNick's programming block?