The Americans recognised his talent and brought him to a special camp in Garmisch-Partenkirchen to entertain imprisoned officers.

Along with Ursula Herking, Dieter Hildebrandt and Oliver Hassencamp, the cabaret artist created a form of sharp-tongued, provocative entertainment of a kind never seen before.

Other voices he dubbed included those of Michel Galabru (Le Gendarme de St. Tropez), Gene Wilder (Frankenstein Junior, the German version of Young Frankenstein), Jack Lemmon (Mister Roberts), Alberto Sordi (Vitelloni) and Peter Ustinov.

Havenstein also presented popular children's television programmes such as "Sport-Spiel-Spannung" ("sports, games, fun") and "Zwei aus einer Klasse" ("two from one school class").

Klaus Havenstein died in the spring of 1998 of a heart attack and was buried in the Nordfriedhof cemetery in Munich.