In DOFP, the X-Men film universe will finally be introduced to Quicksilver, just one of three of Magneto's offspring. In The Avengers 2: Age of Ultron, Quicksilver will make an appearance as well, flanked by twin sister Wanda, better known as The Scarlet Witch. Apocalypse could prove to be the perfect time to showcase the green-haired beauty, either as a major player or possibly as a prisoner in Apocalypse's breeding pens. With the introduction of Havok in First Class and his return in DOFP, the film could actually play on the long-storied romance between the two mutants as well. If they choose to include Cyclops in the film as well (who we will touch on later), they could bring in the twist from the Ultimate X-Men universe and have Polaris be Cyclops' girlfriend before dating his brother. Considering FOX likes to take liberties with the source material, it wouldn't be outside the realm of possibility to see Polaris recruited as a villain, possibly being used as a minion of Apocalypse as a counter to her father Magneto before seeing the light and turning to the side of good. It would surely be more exciting than what originally happened to her in the AOA timeline, where she basically is rendered powerless as a result of a conflict with Rogue (before that timeline's Rogue joins the X-Men).