Nick on CBS (also known as Nick Jr. on CBS) was a Saturday morning children's programming block on CBS that began on September 16, 2000, replacing CBS Kidshow. This Saturday morning block presented programming from Nick Jr., which at the time shared common ownership with CBS under Viacom. When the block first properly aired, the "Face" character provided the continuity.
On September 14, 2002, Nick Jr. on CBS was re-branded as Nick on CBS, and airing both Nickelodeon and Nick Jr. shows. The Nickelodeon shows were removed in 2004 in favor for a return to an exclusively-Nick Jr. block. The block's continuity was provided by segments featuring Piper O'Possum.
All programming during the block, as is standard for Saturday morning network programming, was labeled as meeting E/I requirements. Nickelodeon's most popular animated programming of the time (except for SpongeBob SquarePants and Fairly Odd Parents, which aired as one-time special presentations outside of the block) was not included in the block, both to protect their own successful Saturday morning lineup on Nickelodeon itself and because those shows could not have been classified under the E/I designation.