There have been a few other versions but I think we can all agree that the Cletus Kasady Carnage is better than the rest. I'm not sure when he would appear but my thoughts are that he should be in a Spider-Man reboot or maybe if Spider-Man and Agent Venom show up somewhere in Avengers: Infinity War then he could pop in to wreak havoc against the team alongside whoever else they put in.
They could also go and do Deadpool vs. Carnage just like the 4 issue series by Cullen Bunn, Salvador Espin, and Glenn Fabry. Nobody would mind seeing a DC/Marvel Crossover with Batman and Spider-Man vs. Joker and Carnage, because after all, Cletus Kasady is just as Psychotic as the Joker.
The Carnage USA plot wouldn't be a bad idea either, just mix Spider-Gwen or Spider-Woman in there somewhere and have them try to take down the evil,psychotic,reigning carnage. What would be even better is if the symbiote Venom gotten to fight Carnage.
If you look at the upcoming movies for both Marvel and DC, like Suicide Squad (2016), Batman Vs. Superman: Dawn of Justice (2016), and Venom (2018?) if approved the possibilities are endless. Well give me your thoughts on a Carnage movie and what you think or a movie plot below(no pun intended).