Forge travels forward to 3960 A.D. in X-Men '97 season 2. He uses the time-travel plan he develops with Bishop to search for X-Men stranded in different eras after the destruction of Asteroid M.
The year 3960 is a bleak future dominated by Apocalypse and his forces. Forge arrives there while Cyclops, Jean Grey, Storm, Wolverine, and Morph are caught in the future timeline. He helps locate and support the displaced team as they encounter Mother Askani and a young Nathan Summers.
That future setting is important because Nathan is destined to become Cable. The season therefore connects Forge's rescue mission with Cable's family history and the long-running X-Men theme of trying to prevent a terrible future.
The other major destination is Ancient Egypt, around 3000 B.C. Bishop travels toward that past timeline, where Xavier, Magneto, Rogue, Beast, and Nightcrawler encounter the young En Sabah Nur. The two destinations are not 2099 or 1997; they are deliberately extreme points in mutant history.