Avery took a year-long break from MGM from 1950 to 1951, during which time Dick Lundy took over his unit to do one Droopy cartoon, "Caballero Droopy", and several "Barney Bear" cartoons. Avery returned in late 1951 and continued with Droopy and his one-shots until the Avery unit was dissolved by MGM in 1953. Michael Lah, an Avery animator, stayed on long enough to help William Hanna and Joseph Barbera complete "Deputy Droopy" after Avery had left the studio. Lah himself then left MGM, but returned in 1955 to direct CinemaScope Droopy cartoons costarring either Spike (now called Butch because of the same-named bulldog in Hanna and Barbera's Tom and Jerry cartoons) or the "Kingdom Coming"-whistling wolf. The opening title card was replaced with a newly drawn sequence in which Droopy gives his deadpan greeting: "Hello, all you happy people." Seven Droopy cartoons were created under the H-B production stable. One of these, "One Droopy Knight" (1957), was nominated for the 1957 Academy Award for Best Short Subject (Cartoons). However, by the time of "One Droopy Knight"'s release in December 1957, the MGM cartoon studio had been closed for six months, a casualty of corporate downsizing.