Yup. That sure is the Avengers theme, except on an electric guitar with more… Whammy? It’s some sort of pedal. I don’t know a lot about guitars. I can’t care too much. The Avengers theme isn’t bad, but it’s hardly entered the zeitgeist. We’ve only heard it for a week.
Fair warning. At about 1:40 in the video switches over to the Earth’s Mightiest Heroes theme. Without the godawful singer it’s not as bad as on the show. But it’s not good. And then there’s Iron Man. Which I think was already metal. What else would you define Black Sabbath as?