The Red And Blue Blur

(Clark Kent, reporter, undercover as a cop.)

In a novel by Elliot S! Maggin and also I think in pre-Crisis comics, there were reports of a mysterious "Smallville Angel" preventing accidents and disasters before Clark went public as Superboy. In a later continuity, when Clark had not had a "Superboy" period in his career, there were nevertheless unconfirmed sightings of "the Superboy" running very fast around Smallville.

In Smallville, there is a Red and Blue Blur before there is a Superman in Metropolis. The Blur and the Green Arrow are two vigilantes. Clark's cop partner gives him the standard "badges versus capes" argument that has been familiar since Watchmen.

This post has referred to maybe five continuities:

a novel;
pre-Crisis comics;
post-Crisis comics;
a TV series;
a graphic novel.