My thing is the story from JLA #1 and the first story from the Justice League cartoon is basically the plot of Avengers. Now, if Justice League sticks to their source material, it would just look like they're copying. Also, Thanos from Marvel is a copy of Darkseid from DC comics. Now, DC can't even use their biggest villain because Marvel revealed their copy of him first!
Bonus: Wade Wilson AKA Deadpool is a parody of Slade Wilson AKA Deathstroke







