- "Ladies and gentlemen, I do not know where Dana has gone now. I do hope that we hear from her again."
Former Intern Dana Cardinal is the most often named intern on the show and the longest-appearing intern character. Even before her episode, Cecil is heard calling to her to ask her opinion, mentioning some work she's doing at the station or a cute video she's posted on her Facebook page.
Dana was 22 years old as of 1 April 2014.
Dana In The Dog Park Edit
In The Sandstorm (Part A) Dana is attacked by her doppelganger (or perhaps the other way around) and the two fight. Cecil attempts to save her, but either Dana or Dana's double is dead by the time he can reach her. One of the two is found standing over the corpse of the other, clutching a broken stapler as a weapon.
Dana (or her double) continues to work at the station until she gets stuck in The Dog Park while on an investigation of The Pyramid during Poetry Week. Though she texts Cecil from The Dog Park, telling him that she has made friends with The Man in the Tan Jacket, he was unable to send anything back to her.
Dana In The Desert Otherworld Edit
Dana finally finds a way out of The Dog Park through a mysterious door. Going through the door takes Dana into a strange house, where she discovers John Peters (You know, the farmer) staring at a picture of a window; John Peters can't hear or see her, and Dana can't touch him. Dana leaves the house through the door John Peters presumably entered, and soon after, Carlos and his fellow scientists see her exit the House That Doesn't Exist, talking to Cecil on her phone in a conversation later heard as a message, but she passes right through Carlos, implying that she no longer occupies the same dimension or time as the rest of Night Vale.
She manages to hijack the Night Vale broadcast in WALK, but is unable to communicate with Cecil himself. She has at this point reached the Blinking Light on the Mountain. She apparently is unsure if she herself is the original Dana or the double.
In the episode Cookies, Dana manages to speak directly with Cecil, revealing that she visited a future version of herself, restored to the same dimension and time as the rest of Night Vale, noting that she seems to be someone important in the future. She also reveals that she met Intern Maureen, who had "blinked out" of existence in Orange Grove.
By A Story About Them, she has befriended the masked army, and they are impressed by her ability to survive alone in the empty desert.
In Old Oak Doors Part A, she appeared as an apparition along with Carlos in in the Night Vale Community Radio Studio. Later, in Old Oak Doors Part B, she appeared physically in the same studio. The loud pulses coming from Hidden Gorge revealed that she would be the next mayor of Night Vale, despite never being a candidate.
Mayor Cardinal Edit
Because Dana was elected mayor despite not being a candidate, the declared candidates (Hiram McDaniels and the Faceless Old Woman) did not accept the results of the election, and attempted a Mayoral Coup.
She has attempted to open up the Dog Park, but ended up cancelling those plans due to the involvement of the City Council.
For some time, Mayor Cardinal appeared to find the job of mayor stressful and seemed somewhat resentful at being forced into it. 
When she became comfortable with her responsibilities, she decided to expand her power by taking direct control over the Vague, Yet Menacing, Government Agency and the Sheriff's Secret Police. This idea was criticized by the City Council, who believed that it was their responsibility to maintain balance in Night Vale politics, by Tamika Flynn, who expressed concerns about granting so much power to the Mayor as one day the office may be won by someone who isn't as well-meaning as Dana, and by Sheriff Sam, who said Dana would get the control over the Secret Police "over their dead body". One person in favor of Dana's plan was Tristan Cortez, who - being imprioned for robbery and fraud - welcomed any change in Night Vale government. 
Around the same time, Dana was reported behaving strangely: demanding local shop owners tell them where she was and monitoring the City Hall with binoculars. When she was approached by a secret parking enforcement officer, she apparently killed him. After this, Dana issued a statement in which she calimed that she wasn't the murderer and that the real culprit was her double. 
Dana shows a remarkable talent for survival compared to the other interns, who are often killed on their first mentioned errand. She is a very sweet, kind and polite young woman and is also shown being curious and brave in the face of uncertainty, as well as persevering and resourceful.
Dana mentions that she has a mother and a brother. She asks Cecil over the phone to tell them that she is safe when she manages to exit the dog park. She seems excited to get to see them again. Her father died of liver cancer when she was five years old. When an alternative reality version of her father arrived in Night Vale through a hole in reality, Dana decided to go with him , although she later returned to Night Vale.
She also seems to have a close friendship with Cecil. They are mentioned as being friends on Facebook and Dana speaks in a fond and familiar manner to him on the phone. Dana is the only Intern Cecil ever shows any long-term concern for.
Dana seems fond of Carlos, whom she found in the desert. She called him a hero for making plans to get everyone home.
Dana has called Tamika Flynn a hero and an inspiration, although she was disappointed when her own armies got overshadowed by Tamika's militia.
- Dana is voiced by actress Jasika Nicole and has appeared in a number of episodes: episode 30 Dana, episode 41 WALK, episode 44 Cookies, and Old Oak Doors Part A and Old Oak Doors Part B. Jasika Nicole is also the voice of the narrator of Alice Isn't Dead, written by Joseph Fink.
- Intern Vanessa seems to be Dana's Desert Bluffs counterpart.
- As revealed in Old Oak Doors Part B, Dana's last name is "Cardinal."