I'm currently watching Once Upon A Time again, as a new season for me has been released. I am aware that there is a spin-off series calles Once Upon A Time In Wonderland, but I'm not sure when this spon-off hooks in.
As I'm scared of spoilers I won't look on the interwebs. I'm looking this series with my girlfriend and it's a total tension breaker when one knows what will happen and the other not.
So does "In Wonderland" contain plots that may be relevant to the main series? Like one re-occuring character that made something up, which then is important in a new season in the main series?
Or maybe in other words: Is there a specific time when I should watch "In Wonderland" first instead of continueing with the main series?