Is Underdog a Disney movie?
Yes, Underdog, released in 2007 IS a Disney movie.
In the cartoon series he was voiced by the actor Wally Cox. Many people know Mr. Cox primarily as (Underdog!) I think he was on Carson once and some younger people in the audience shouted out Underdog. When he came on the show, the band ( Doc Severinson and the NBC Orchestra) let go with the opening bars of Underdog.