https://www.cbr.com/most-epic-comic-book-creator-feuds/

 Quote:
10. TONY ISABELLA VS. DC


Debuting in his own series in 1977, Black Lightning was one of DC's first major African-American superheroes. Tony Isabella came up with the concept for the character, writing the first 10 issues of the series, while Trevor Von Eeden was brought on board to contribute to character design and draw the series. After the cancellation of Black Lightning's first series, in 1978, Isabella sought to buy out DC's interest in the character, only to find that DC declared Von Eeden as the co-creator. This contrasted with Isabella's belief that the character was introduced under a partnership between him and DC instead of through work for hire.

Over the next few decades, Isabella was very vocal about DC's approach and their poor treatment of him and the Black Lightning character. Finally, in 2017, Isabella and DC resolved the dispute, the official credit line now stating: "Black Lightning created by Tony Isabella with Trevor Von Eeden."