“(…) In Swamp Thing #87 (June 1989), the green plantman goes to Camelot. In page 8, there is this dialogue between him and Merlin:
“‘That Knight [the Shining Knight] that drew me out of the wormhole… HE is able to travel through time?’
“‘Sort of. First let me explain that time is a complicated thing. In fact, what many think to be time travel is merely the exploration of ALTERNATE worlds.
“‘But at some point during YOUR era, a sort of CONVERGENCE of the worlds seems to have occurred.
“‘And all the endless possibilities were boiled down into a single reality, which is MUCH easier to set up a direct channel to.’
“‘HMMM. An interesting theory. Others I have encountered… have espoused it as well. But if there were… a CRISIS on such a scale… I’m sure I would REMEMBER it.’ (…)”