Boomerang was first introduced on November 1, 1993 (six months after the original introduction of Cartoon Network) as a block on Cartoon Network for classic cartoons ranging all the way back to the early 1900's. Prior to early 2000, it didn't have a proper logo. Thus, like Nick at Nite, its logo was constantly different along with a different theme for the block. Sometime prior to the rise of the channel of the same name, it started using the following logo, especially during the pre-launch animation of the channel.
Boomerang (TV channel)
On September 28, 2014, Boomerang in Brazil rebranded using the 2014 logo, as part of Boomerang's ongoing global rebrand.