The recent San Diego Comic-Con revealed so many things.

In the Season 3 ending of "Once Upon a Time", viewers saw Elsa come to Storybrooke. At Comic-Con she was seen with Anna in Arendelle.

"Once Upon a Time" creators Adam Horowitz and Edward Kitsis were at Comic-Con together with the cast members including Charming (Josh Dallas), Emma (Jennifer Morrison), Hook (Colin O'Donoghue), Henry (Jared Gilmore), Regina (Lana Parrilla), Belle (Emilie de Ravin) and Rumplestiltskin (Robert Carlyle). They were at the convention to discuss the new developments for "Once Upon a Time."

According to Science Fiction, it is not only Queen Elsa that will be appearing in Season 4. More characters from the movie "Frozen" are expected to appear in the new season of "Once Upon a Time." Season 4 will premiere on ABC on Sept. 28 in its normal Sunday evening slot at 9/8c.

Princess Anna and Kristoff (Scott Michael Foster) will be in the new season. Prince Hans of the Southern Isles will be making an appearance as well and it had been revealed that he would be seen in the third episode of Season 4. Henry and Rumplestiltskin's relationship will be developed in Season 4. Likewise, Hook will be donning regular clothes instead of the heavy pirate costume he used to wear.

The clip shown at the convention showed Anna (Elizabeth Lail) and Elsa (Georgina Haig) at Arendelle. They were laying flowers at their parents' graves. The costumes of the two characters were similar to the costumes worn by the animated film characters. Even the hairstyles were the same.

The love between the sisters was apparent in the clip, IGN reports. Elsa told Anna that she got a surprise for her wedding. Viewers are now guessing that the wedding of Anna and Kristoff will be shown on screen. It also seemed like Elizabeth Mitchell would not be portraying the mother of Elsa and Anna.

Those that have been lucky enough to see the Season 4 preview at Comic-Con were commenting that the production went to great lengths to create the costumes seen in "Frozen." However, some were thinking that the longer hair Scott Michael Foster used to sport would have been perfect for his role as Kristoff.