Wagner also voiced a lot of the Disney characters in the 1980s, primarily for live entertainment offerings in the parks and in Disney on Ice shows.
One of his most famous lines is from a safety spiel at the Matterhorn Bobsleds attraction: "Remain seated please; permanecer sentados por favor." This line is reprised in the nostalgic fireworks show Remember... Dreams Come True and is also heard in Toy Story 2 and in the Phineas and Ferb episode "Rollercoaster: The Musical!".
Outside of Disney, Wagner also enjoyed a lengthy career as a radio announcer at KNX in Los Angeles and as a TV actor, his best-known role being that of the malt-shop proprietor in The Adventures of Ozzie and Harriet. He was the younger brother of noted choral director Roger Wagner. Wagner's son Mike, a former disc jockey and radio programmer, is a Disney executive and also provided park announcements for Disneyland Paris.
He was inducted as a Disney Legend posthumously in 2005.
Currently, Wagner's voice can only be heard in a few places. The Matterhorn safety spiel still has his voice (but now goes "Remain seated with your seatbelts fastened", which was formerly a breakdown spiel), as do the Disneyland Railroad train station announcements. His voice can also still be heard when the doors of the Walt Disney World Monorail trains are closing, partly because it is on a system separate from the rest of the spiel system (currently Tom Kane).