I agree with the Metamorpha and Doom Patrol, but I think the phase that led directly to the eventual moarvelization of DC started when Conway came over and put in some long running soap opera themes and some random angry characters in his books. Steve Englehart extended it, and then the explosion hit full stride with the New Teen Titans, which could have been a Marvel book. In my mind, by the early '80s almost all books were Marvelized... Even Julius Schwarz capitulated with the Trial of the Flash. At this point you had Wolfman, Wein and Thomas all over at DC...