Fans of 'Once Upon a Time', the fairytale drama series on ABC, are excited as Elsa (Georgina Haig) and Anna (Elizabeth Lail) are set to join forces in Arendelle as the show continues to explore the desperation of the Snow Queen (Elizabeth Mitchell).

In a recent interview with TVGuide, actress Elizabeth Lail talked about Elsa and Anna, and revealed that the two "get to work together back in Arendelle." She further said, "So we get to see the two sisters become a team and formulate a plan."

The TVGuide report says that when Elsa and Anna decide to work together it makes things more difficult for the Snow Queen, who now very desperate to separate the 'Frozen' sisters.

Meanwhile, Elizabeth Mitchell doesn't know if her character, the Snow Queen, will be able to succeed in her plan to develop a sisterhood with Elsa and Emma (Jennifer Morrison).

Talking to Access Hollywood, Mitchell said, "Whether or not she can come back, I don't know. It's interesting." The actress added, "I do believe that people can be redeemed, but it's a hard case here. I mean, she's basically saying that people who are magical are worth something and people who are not, are not and that's really terrifying to me. Any time you get into that is really pretty horrifying to me."

While Mitchell did not make any attempt to defend the Snow Queen's destructive tendencies, she acknowledged that this would happen to anyone who has been frozen for such a long period of time.

She told the website, "I think that you lock somebody up even in just a cage for a year and they'll go out of their mind. This is 30 years; this is a crazy woman, so I think she's completely mad."

Meanwhile, a report by Enstarz says that the next episode of 'Once Upon a Time' will reveal what Regina (Lana Parrilla) will do if and when she meets the storybook author.

The next episode of 'Once Upon a Time' Season 4 airs Sunday, Nov. 16, at 8 pm ET/PT on ABC.