RTTE S5 E2, "Sand Busted"

What if Astrid could not figure that map of the Treasure of Tears? (Sorry Tuffnut)
What if it took too long for Hiccup, Snotlout, and Amus to escape the vicious Sand Buster's den?
In the full two years Hiccup Haddock and his company were presumed dead, victims to the Curse of Tears, Berk held their funeral, honored their names, and moved on.
Except for Astrid. She could never move on. "It's just... this feeling. That through all this, he's alive. He's Hiccup! ...right?" But as time went on, people started to believe Astrid was cursed. "The Curse of the Broken" they would call it. They said only someone of deep importance in ones last could break the curse.
But when a scruffy trio going by the names Sun, Nightmare, and Inferno show up on Berk, Astrid can't help but feel as if they are familiar.
But from where? Or more importantly, when?

Using other code names from other universes, Fite meh
Ehhh I feel like this is really close to Rogue but whatever