Let's ignore the fact that Moore didn't believe that the TV series would take off and so willingly put forward the contract he is now in to give Kirkman the rights to the show and its proceeds. Moore also stopped drawing, inking and grey-toning the comic book series after issue SIX, being replaced by artist Charlie Adlard (who continues to do the series). Sure, Moore continues to do the covers and is owed for this work, but he has not been "swindled" out of anything.
Kirkman told the Hollywood Reporter:
The lawsuit is ridiculous, we each had legal representation seven years ago and now he is violating the same contract he initiated and approved and he wants to misrepresent the fees he was paid and continues to be paid for the work he was hired to do. Tony regularly receives payment for the work he did as penciler, inker and for gray tones on the first six issues of The Walking Dead comic series and he receives royalties for the TV show, to assert otherwise is simply incorrect.Kirkman is also, let's not forget, the creator of the series - as all the inside comic-book credits point out - and Moore as responsible for "penciler, inker, gray tones".
So, the story seems to be that the creator of the franchise was approached about making a TV show out of his comic book. The artist and collaborator didn't believe in the project and put forward the contract within which they are currently bound - in which he does receive royalties from the TV show. The show then becomes a sensation and the creator is shot forward into fame and fortune and the artist feels he was swindled.
I'm sorry, but that is simply ridiculous. I cannot believe someone with Moore's talent and reputation would have the gall to put forward such a lawsuit and damage himself and Kirkman with the claims he is making. Face it, Moore, you signed away your rights - with legal council present for both you and Kirkman, on a contract you agreed on - and now that it's popular, you want your piece of the pie. Grow up.