Looks like fan favourites Elizabeth Lail and Elizabeth Mitchell from the “Frozen” arc in “Once Upon a Time” are returning to our TV screens.

Although the return won’t be with the rest of the Charmings in their journey to the underworld, Lail and Mitchell–who played Anna and the Snow Queen, respectively–are teaming up with “Once Upon a Time” creators Edward Kitsis and Adam Horowitz for a new project called “Dead of Summer”.

In a report by Entertainment Weekly, it is detailed that Mitchell will play a character named Deb who is the new owner of Camp Clearwater. Camp Clearwater will be the setting for the new series. Meanwhile, EW relays that Lail will play the character of Amy–a camp counselor.

Much like her sleuthing skills in “Once Upon a Time”, Lail’s Amy in “Dead of Summer” may also share the same characteristics. EW further describes her character as the “first to discover clues that something disturbing is going on at Camp Clearwater.”

Whatever it is that she discovers may centre at the mystery of the new show.

Meanwhile, TV Guide reports that Lail and Mitchell will be joining the previously-announced cast including Paulina Singer, Mark Indelicato, Zelda Williams, and Ronen Rubinstein.

The new series, which will air on Freeform, is scheduled to begin production this coming March.

In another news, TV Line reports that younger versions of sisters/enemies Regina (Lana Parilla) and Zelena (Rebecca Mader) will show up when “Once Upon a Time” airs its remaining episodes of season 5.

Since the appearance of the younger characters means that a flashback will happen, it is still unknown how this will tie to the Underworld storyline for season 5B. If one would guess, the flashback may give insight as to how Hades and Regina are related.

It has also been revealed that Captain Hook (Colin O’Donoghue) has an integral role when the show shifts to the underworld, so it cannot be neglected that the history of the sisters may also have an impact on him.

“Once Upon a Time” season 5 returns this coming March 6 at 8 p.m. on Freeform.