Pardo made his mark on game shows for NBC as the voice of the original The Price Is Right from 1956 until it moved to ABC in 1963. Pardo's next show was Jeopardy!, which he announced from 1964 until the original version of the series ended in 1975. Pardo also announced New York–based NBC game shows such as Three on a Match, Winning Streak, and Jackpot!, all three of which were Bob Stewart productions.
Pardo was the on-duty live booth announcer for WNBC-TV in New York and the NBC network on November 22, 1963, and he was the first to announce to NBC viewers that President John F. Kennedy had been shot in Dallas, Texas.