Kids' WB! is a children's block of The CW that started in 1995. It was originally the block of The WB Network until they merged with UPN in 2006. It was known to be the home of Pinky & The Brain, Pokemon and more.

Kids' WB debuted on Saturday, September 9, 1995, airing on Saturday mornings from 8:00 a.m.-11:00 a.m. ET and weekday afternoons from 4:00 p.m.-5:00 p.m.

On September 3, 2001, Kids' WB ceased airing weekday morning programming, and gave that slot to the local affiliates. On January 2, 2006 the whole weekday block of Kids' WB was replaced, but the weekday-afternoon block got replaced by the new Daytime WB block. As a result, the Saturday morning block got an extra hour on January 7, 2006, and started to run from 7:00 a.m.-12:00 p.m., no longer affected by time zone "at the request of the local affiliates".

On September 23, 2006 Kids' WB! premiered on The CW.

On October 2, 2007, the network announced that it was ending the Kids' WB block due to the effects of children's advertising limits and cable competition, as of September 2008, in a joint decision between Warner Bros. and CBS, parent companies of The CW. At that time, the programming time will be sold to 4Kids TV. With this deal, in the 2008-2009 season, 4Kids ran two different Saturday morning blocks;
their new 4Kids Entertainment block on Fox, and The CW's children's programming block.

In 2012 it was rebranded as Vortexx. The black was cancelled in fall 2014 with the bankruptcy of 4Kids bringing an end to traditional Saturday Morning Cartoons on broadcast television.