City Councillor At-Large Michelle Wu’s mayoral campaign on Thursday unveiled a TV ad that they plan to run in English and Spanish up to the Sept. 14 preliminary.

The campaign has spent more than $300,000 on airing the ad, with it set to appear on cable, broadcast and Spanish television, as well as streaming platforms like YouTube and Hulu.

The 30-second ad, titled “Working for You,” opens with an employee of Mike’s City Diner in the South End calling Wu an effective leader and ends with Wu saying, “As mayor we’ll make housing and transportation more affordable for everyone, and we will finally tackle the high cost of living.”

The ad is available here.

Wu is one of five major mayoral candidates. With the preliminary weeks away, three have now gone on TV, including City Councillors Annissa Essaibi George and Andrea Campbell. Campbell, who represents Dorchester and Mattapan as a district councillor, is getting help on TV from the “Better Boston” super PAC.

A pro-Wu super PAC, tied to the Environmental League of Massachusetts, last week reported spending $47,000 on digital advertising.

Former city economic development chief John Barros has an ad he is trying to get on the air, while Acting Mayor Kim Janey’s campaign, in an Aug. 11 fundraising plea, said they were “about to launch” their first TV ad.

The Sept. 14 preliminary will winnow the field to two finalists, who will face off on Nov. 2.