Well, not quite.
The characters are alive and well.
But the actors who defined them have passed away.
Francis Matthews, who sounded exactly like Cary Grant, was the voice of Captain Scarlet (whose "look" was based on Grant) on the cult-hit 1960s puppet tv series.
Casey Kasem was Shaggy on the various Scooby Doo tv series...
plus Alex on the several Josie and the Pussycat shows and numerous other one-shot voice-overs.
Though they are gone, their performances will live on...