X-Men: Cyclops & Phoenix: In the clutches of Apocalypse!

Scott Summers and his wife Jean are enjoying their honeymoon when they are dragged 2000 years into the future by their daughter from an alternate timeline, Rachel. She needs them to help raise Nathan, Scott's son from an evil clone of Jean, who had been kidnapped by one of Rachel's disciples to protect him from the ageless mutant Apocalypse, and to stop him from completing the genocide of the human race. Their best bet of doing so involves Stryfe, the evil clone made of Nathan before he was infected with Apocalypse's techno-organic virus. Scott and Jean stay with Nathan for ten years, never revealing who they are.

If this seems needlessly convoluted and angst-driven, well, welcome to the world of 1990s X-Men comics.

By the end of the story, Scott, Jean, and Nathan team up to kill Apocalypse, stopping his genocide of the human race, and then our two heroes are sent back to their/our time, where they learn that only two hours have passed since their disappearance into the future. Which ties everything up in a nice little package that ensures they can never speak of these events again, and don't have to worry about any pesky “character development”.