1998

In 1998, Tom Dering was the President of the United States of America. (PROSE: Option Lock)

According to some accounts, Sarah Jane Smith had married Paul Morley by this year. (PROSE: Christmas on a Rational Planet, Interference - Book Two)

Dated events
In the summer, Iris Wildthyme and Panda visited an English village and encountered Andrew. (PROSE: Dog Days of Summer)

In August, the Eighth Doctor, Liv Chenka, and Helen Sinclair visited Calcot and found that it was being affected by a piece of the Doomsday Chronometer. The piece's proximity to a newly installed cellphone tower allowed calls made within the town to reach into the past to dead loved ones. The Doctor and Liv found the piece while Helen met with her brother George, who died shortly before the Doctor, Helen, and Liv left. (AUDIO: Absent Friends)

In autumn, various important people infected with Khameirian mental energies attempted to start a nuclear war to give the Khameirian the massive amounts of radiation needed to awaken. The Eighth Doctor and Sam Jones visited rural England and spent several nights in Norton Silver's mansion. Through Silver, they discovered the Khameirian plot in time to prevent them from accessing Station Nine and starting a war. (PROSE: Option Lock)

On 12 October, Thomas Hector Schofield was born to Cassandra Schofield in the Royal Bolton Hospital. (AUDIO: The Harvest, Thicker Than Water, Project: Destiny)

In the 1998 Christmas shopping season, the time-active children's toy Parablox was released. Shortly after Christmas ended, the Great Houses erased the remaining Parablox stock from the timeline. (PROSE: The Book of the War)

On 24 December, the Ninth Doctor changed history by giving the twelve-year-old Rose Tyler a red bicycle which the nineteen-year-old Rose never got for Christmas. A minor setback occurred when Jinko stole the bicycle and took it to the Andromeda galaxy, but the Doctor got it back and put it under the Christmas tree in 48 Powell Estate while Rose and Jackie Tyler visited Nanna Prentice.

On 25 December, Rose unwrapped the red bicycle which the Doctor had left for her. (PROSE: The Red Bicycle)

Undated events
The Fourth Doctor and Sarah Jane Smith prevented the Voracian invasion of Earth. The Doctor claimed that 1998 was "not one of [his] favourites." (PROSE: System Shock)

Sarah Jane Morley addressed the Nobel Academy. (PROSE: Christmas on a Rational Planet)

Michael Campling's Shakespeare's Playing Space was published. (PROSE: Theatre of War)

Sally Hunt's mother died. (PROSE: Damaged Goods)

When she encountered Magnus Greel in Reykjavik in the 51st century, Romana II gave him a business card for an excellent plastic surgeon in 1998. (PROSE: Under Reykjavik)

Yasmin Khan was born in this year. (COMIC: A New Beginning; PROSE: The Secret in Vault 13)

Behind the scenes
According to a sighting report sent to Whoisdoctorwho.co.uk by someone under the username "SkipN", the Ninth Doctor attended a game in this year. He told "SkipN" that the team would be successful in 2004.