Dawn Bellwether

Dawn Bellwether is the hidden main antagonist of Disney's 55th full length animated feature film, Zootopia (Zootropolis in Europe).

She is voiced by Jenny Slate who also portrayed Zoe in Alvin and the Chipmunks: Chipwrecked.

Official Description
Assistant Mayor Bellwether is a sweet sheep with a little voice and a lot of wool, who constantly finds herself under foot of the larger-than-life Mayor Lionheart.

Personality
At first glance, she appears as a meek, shy, kind, energetic and eager person. She sympathizes with Judy, as she feels the two are both under-appreciated and underestimated and claimed herself as Judy's friend in City Hall. She is eager to help and excited she could be of use since she feels her job as assistant mayor is more of a glorified secretary job. It is obvious throughout the film that she mostly does paperwork and menial jobs while Lionheart is a glory hound who shoves the work on her and gets the glory.

She is actually very deceptive and prejudiced against predators because, as she puts it, they are only 10% of the population and she seems to view them as dangerous and unintelligent in comparison to the prey. She is power hungry and willing to let prey get injured by the predators she turns savage in order to maintain power and turn the populace against the predator minority (showing that despite claiming she cares for prey, she ultimately thinks nothing of sacrificing a few for her cause). She is sadistic, merciless and sociopathic, killing anyone who gets in her way and enjoying their pain. She is intelligent, managing to frame Lionheart for her crimes and staging everything to look as if predators have gone savage.

However, she does prove to be a show off once her true colors were revealed, bragging about her plan before trying to finish off Judy and Nick, which proved to be her downfall. She gets arrested with her right-hand Doug and her other henchmen.

Role in film
Bellwether is first seen during Judy's induction into the Zootopia Police Department, where she stands alongside Lionheart, and is tasked with badging Hopps. Bellwether shows great pride in Zootopia's first rabbit officer, proclaiming that it is a momentous day for "little guys", referring to prey. Before her words can run further, Lionheart rudely removed Bellwether from Judy, and subsequently blocked her from the flashing cameras of the press.

Following Judy's first day as an officer, Emmitt Otterton goes missing, forcing his distraught wife to seek help. Bellwether is present when it is Judy who volunteers to find Emmitt and sends Lionheart a knowing text to congratulate him on the growing success of the Mammal Inclusion Initiative, referring to Judy's newfound role as a detective to a major case. Bellwether then speaks to Judy, telling her that she always has an ally at City Hall, should she need any important favors.

Later on, Bellwether returns to City Hall, where she is seen struggling for Lionheart's attention, needing him to discuss various matters regarding the city. Lionheart, seeming more aggressive than usual, coldly asks Bellwether to take care of the matters herself, and to cancel his afternoon, as he needs to run out for confidential matters. Feeling defeated and exhausted, Bellwether sadly gathers the paperwork to begin her assignments, before receiving a surprise visit from Judy and her accomplice, Nick Wilde. Judy explains that she needs access to the city's traffic cameras, which Bellwether obliges to in her "office", which is really the boiler room. While doing so, Bellwether laments to Judy and Nick, expressing her excitement in doing something of importance, to which Judy replies with confusion, as she believes the title of "assistance mayor" to be rather major. Bellwether merely sees it as being a "glorified secretary", and notes her suspicion that Lionheart may have selected her for the sake of winning the sheep vote. Just then, Lionheart pages Bellwether, scolding her for failing to cancel his afternoon. Bellwether hurriedly rushes to finish this assignment, leaving Judy and Nick with her computer.

Using the traffic cameras, Judy and Nick are able to find an asylum with over a dozen predator mammals imprisoned, and all of which have mysteriously gone savage. The imprisonment was at the hands of Mayor Lionheart, who was desperately searching for the reasonings behind the mysterious outbreak, but to no avail; keeping it confidential to prevent citywide panic, and by extension, the loss of his position. Judy alerts Chief Bogo, and Lionheart is arrested and removed from office. Bellwether, as a result, becomes the official mayor of Zootopia.

Judy, meanwhile, is hailed a hero, and a press conference on the savage predators is held. Bellwether is present, and to her advantage, Judy accidentally calls out predators as naturally savage, with potential to revert to their original, bloodthirsty natures; disturbing the press and causing a citywide panic. Following these events, Bellwether summons Judy to her office and, alongside Chief Bogo, offers her to be the public face of the Zootopia Police Department, as prey mammals look to her as a hero for uncovering the truth about predators. Judy denies, feeling she's failed the city, having torn it apart instead of making it a better place, and officially resigns from her position as a police officer.

Some time afterwards, Judy discovers that unique flowers known as night howlers are the cause of the strange behavior infecting predators—not natural instinct—and rushes back to the city to reveal the truth. After she and Nick interrogate Duke Weaselton, they discover that a ram named Doug has been going around purchasing night howlers, and creating a drug that, when injected into predators, turn them savage. Judy and Nick infiltrate Doug's laboratory, and a battle ensues, with Doug being accompanied by a number of additional ram minions. Nick successfully retrieves the evidence to show Bogo, but before he and Judy can make it to him, Bellwether arrives.

She asks for the case containing the evidence, presenting herself as being proud of Judy's success, but when Judy questions how Bellwether knew of their whereabouts, the ploy is broken, and Bellwether sends her rams to capture the heroes. Judy is injured while trying to escape, and she and Nick are eventually thrown into a pit. Though Bellwether made an attempt to have Judy join her side, she instead results to turning Nick savage so that he would kill Judy, and the entire situation would look like another savage outbreak demonizing predators. However, Nick reveals that the darts of Bellwether's night howler gun was replaced with blueberries, meaning he never turned savage. When he and Judy threaten to inform the police of Bellwether's crimes, she is unfazed, claiming that it's "her word against theirs". However, Judy used her voice recorder to record Bellwether's confession, and played the tape, just as Bogo and his force arrived.

Bellwether is arrested along with her accomplices, and is sent to prison. During the credits, she is last seen angrily watching a live stream of Gazelle's concert performance.

Trivia

 * The term " bellwether " refers to a sheep that leads a herd. This sheep will typically be marked through the use of a bell, hence the "bell" in Bellwether.
 * Bellwether is similar to Lil' Lightning as they are both initially friendly but are severely unappreciated by their superiors (Lionheart for Bellwether, Thunderbolt for Lightning ) and they become so fed up with it, that they eventually betray boss and try to take over by stealing their bosses' jobs (Bellwether: become mayor of Zootopia, Lightning: to take Thunderbolt's place on the TV show), so they can take over and finally be out of their boss' shadow.