Doing it all over again

"Elsa is more powerful than we thought, she managed to create a portal! How are we going to get back to Storybrooke this time? You said it yourself that the walls were down between the realms, any ideas?" She rambled on, but he wasn't concentrating on her. He was concentrating on what was behind her. "What?" She turned around."No Way." They have landed back in time again, but when?