Justice League: 29 Easter Eggs & References You Need To See
2. Captain Cold
Barry Allen's hideout is full of monitors displaying technological data about his Flash suit, and yes, that aforementioned episode of Rick and Morty.
However, those who pay ultra close attention might notice that one of the screens contains a reference to "cold resistance", which seems to imply if not outright confirm that The Flash has had a run-in with the villainous Captain Cold in the past, and adjusted his suit accordingly.
Now, don't get your hopes up for seeing Captain Cold appear in the DCEU anytime soon, but yes, he's pretty much confirmed to be out there somewhere.
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