Hero at Large

Hero at Large is a 1980 comedy film starring John Ritter and Anne Archer. The film was written by former Disney screenwriter, AJ Carothers and directed by Martin Davidson. The original music score was composed by Patrick Williams.

Nichols is hired by the mayors staff, who hope that Captain Avengers tiein will help the mayor win an upcoming election. The plan is discovered and revealed by the media, and Captain Avenger finds himself on the outs with the public. Prodded by his girlfriend Jolene to be himself and not rely on a costume and mask to gain adulation, Nichols becomes a bona fide hero when he rescues a young child from a fire at an apartment building.

Source: Wikipedia