Frank McHugh was perhaps the epitome of a reliable supporting player. You know this guy — you might not know his name, but you know his face.

As a Warner Brothers contract player in the ‘30s and ‘40s, no one backstopped stars like Bing Crosby, William Powell, and James Cagney better than McHugh. He was an expert at sheepish expressions, jittery laughs, and screwball action, usually serving as comic relief and providing larcenous or romantic complications when required.

McHugh was born into a stage family on May 23, 1898, and appeared in vaudeville with his siblings Matt and Kitty by the age of 10. Drawn from his stage career by the arrival of talkies, he arrived in Hollywood in 1930, signed with Warner Brothers almost immediately, and appeared in nearly 90 films in his first 10 years with the studio.

He was also known as a central member of the…