qnli question: Which characters on The Rocky and Bullwinkle Show used a device that allowed them to travel through time? sentence: In one of the animated cartoon's component segments, Peabody's Improbable History, lead characters Mr. Peabody and Sherman routinely used a time machine called the "WABAC machine" (pronounced way-back) to witness, participate in, and, more often than not, alter famous events in history.