The question asks about the longest running English language TV cartoon that was launched in 1969 by Warner Brothers and is popular on the Cartoon Network. Let's evaluate each option to find the correct answer:
- Scooby Doo: This animated television series first aired in 1969. The show, featuring a group of teenagers and their Great Dane solving mysteries, was originally produced by Hanna-Barbera and distributed by Warner Bros. It has remained a popular cartoon, especially on the Cartoon Network.
- Tom and Jerry: Although a classic cartoon from the 1940s, Tom and Jerry do not fit the criteria since they were not first launched in 1969.
- Popeye: Popeye is another vintage cartoon character that premiered well before 1969.
- Johnny Bravo: This cartoon premiered in the 1990s on the Cartoon Network, eliminating it from consideration.
Given these evaluations, Scooby Doo is the correct choice as it matches all the criteria provided in the question: it was launched in 1969 by Warner Brothers and remains popular on the Cartoon Network.