Although the voice actors aren't credited, it's likely that Mel Blanc provided the W.C. Fields imitation for Dr. Quack, as he had already done so in previous cartoons for a variety of studios.
The first short produced by Metro-Goldwyn-Mayer's in-house animation studio, MGM Cartoons, was founded on 1937 and released in 1938 after the Harman-Ising staff were fired from MGM, until the very last Harman-Ising cartoon The Little Bantamweight (1938) were released the same year where Hugh Harman and Rudolf Ising left due to animation budget problems since this short and Fred Quimby is originally served as head president and producer of MGM. Later, William Hanna and Joseph Barbera (creators of the once-popular Tom and Jerry series) became the head president and producer of MGM in 1955 after Quimby retired and started creating animated television projects in 1957 after MGM Cartoon Studio was shut down. (However, the last Tom and Jerry short, Tot Watchers (1958), was produced in 1957 but wasn't release until 1958 after Hanna and Barbera were working on television animated projects.)
The first MGM cartoon that William Hanna and Joseph Barbera had worked together in this short until Puss Gets the Boot (1940), the very first Tom and Jerry cartoon where Hanna and Barbera first directed with Rudolf Ising in 1940. Meanwhile, after Fred Quimby retired in 1955, Hanna and Barbera became the head president and producer of MGM before successfully started creating television animation projects in 1957 after MGM's original animation studio closed down.
On Friday, 1 October 1937, MGM signed Robert Allen as director of its new series of cartoons based on Rudolph Dirks's "The Captain and the Kids" newspaper comic-strip feature. The company also signed George Gordon as layout man and animator for the series. Gordon had previously been with TerryToons for seven years.
The first Captain and the Kids cartoon produced from the Hanna-Barbera era.