Summer, although I've got all 7 series of "Once upon a time", I've re-seen the first 3 which were on Freeview, and the 4th series but have yet to see the later series. I'm aware that the 7th series does have the actors who played Regina, Hook and Rumplestiltskin in the earlier series are in all of the episodes and that the final episode has lots of people from the previous series in.