Mary Sue Brown

Mary-Sue Brown was the final Associate of the Third Inspector and the first Associate of the Fourth. She was played by Mary McDonnell during Seasons 11-14.

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Mary McDonnell as Mary-Sue Brown.

Travels with the Inspector

Initially introduced to the show as a feminist photographer, she begins traveling with the Inspector after being abducted by his DARSIT. She continued to stay on with the Inspector after he underwent Metamorphosis. During her travels, she met the Blogons, Arachnids, Rostraaans, Metalguys, and Squid-beings. She is chooses to leave the Inspector in the episode "The Foot of Terror" after he is forced back to Kayaclasch, but not without arguing with him about being overly sensitive towards her human nature. Although never explicitly stated, it is heavily implied that the Inspector had feelings for Mary-Sue when she traveled with him as an Associate.

Later on, FE-Line abandons the Inspector and joins with Mary-Sue. This was supposed to be the key plot of the spin-off FE-Line and Friends, but the series never got off the ground.

Reunion with the Inspector

In the reboot of the series, both Mary-Sue and FE-Line were reunited with the Tenth Inspector in the Series Two episode "The Embarrassing 15th Anniversary Reunion" while he was investigating happenings at a local nursery school during Picture Day, in which Mary-Sue was the photographer. This caused some conflict between herself and Lily, which remains unresolved to this day. She also reappeared in the Series Four episodes "Return to Earth" and "Finale" and at the end of the 2009 Christmas Special "The Last Minutes" in a non-speaking role.

FE-Line and Friends and The Mary-Sue Mysteries

Mary-Sue was intended to be the star of an Inspector Spacetime spinoff known as FE-Line and Friends, but it never got off the ground. The character was given her own spinoff in 2006, The Mary-Sue Mysteries, where she defends Earth from alien invasions with help from her adopted son Mark, FE-Line, and their teenage friends Elizabeth, Nitya, and Roy.

Facts

Given her role as the Fourth Inspector's Associate and that Inspector's rating as the Most Popular Inspector by the public, she has consistently been rated Most Popular Associate, though Lily Taylor and Constable Horace Wigglesworth have taken over that spot in recent years.

The Inspector is the only one Mary-Sue does not permit to call merely by her first name, Mary. When Nitya corrects him on this, the Inspector states that "She likes it when I call her Mary-Sue."