Dum Dum

Dum Dum is a human from Marvel.

Dum Dum works for America's super-spy organization S.H.I.E.L.D. with his pal Nicholas. He sports a mustache and wears a bowler.

Fiction

When the Transformers caused their first ruckus upon waking up in 1984, Dum Dum thought it was a situation worth looking into. Prisoner of War!

It didn't appear that the two ever actually looked into what was going on in Oregon at all. If they did, they sure didn't do anything about it.

Dum Dum was once portrayed by Garry Chalk in the Nick Fury: Agent of S.H.I.E.L.D. made-for-TV movie starring David Hasselhoff. A dubious honor (for Chalk, we mean).
William Morgan Sheppard voiced Dum Dum in the 90's Iron Man cartoon, Kevin Michael Richardson in Marvel Mashup: Iron Man and Brian Bloom also voiced him in the Marvel Rising Ultimate Comic motion comic.