In the Star Trek: Enterprise episode "Azati Prime", Captain Jonathan Archer is briefly transported to an possible future 26th century (in the Star Trek universe) in which the Klingon Empire has joined the United Federation of Planets. Archer visits a hypothetical USS Enterprise (NCC-1701-J) in this episode.
Miscellaneous entries
The year 2525 became prominent in 1969 when it was used in the Zager and Evans song In the Year 2525, which reached number 1 in the Billboard Charts for July 21. The song opens with the words "In the year 2525, If man is still alive, If woman can survive, They may find...".