Hubby and wifey are in love, but he's henpecked by her mother. A nip of whiskey gives him Dutch courage, and he storms out, declaring he won't be a domestic slave anymore. He heads for a park bench where a photographer mistakes him for a seated woman's sweetheart. The tintype of the two of them falls into the hands of the woman's husband, whose jealous rage frightens our hero. He abruptly leaves town, telling wifey he'll be away on business. Wifey doesn't need her house while he's away, so, unknown to hubby, she moves in with mom and rents the house to the couple from the park. When our hero returns home sooner than expected, the renter has another attack of jealousy.

Don Maxwell is an ex-vaudeville ham, wanted by police, who has now found himself as the unlikely assistant to Dr. Meirschultz, a mad scientist in the business of reanimating corpses. Maxwell's gift of impersonation gets him and Meirschultz past the guards and into a morgue where they use a special serum to revive the corpse of a pretty young woman. But that's nothing. Dr. Meirschultz has a heart beating in a jar of solution and is eager to put it into a corpse that really needs it. Meirschultz gives his assistant a gun and advises him to commit suicide, so that he can put the heart in him, but Maxwell shoots and kills the scientist instead and hides the body. People will miss Meirschultz, Maxwell quickly realizes, but no one will miss his lowly assistant; and so Maxwell dons eyeglasses and a fake beard to become his onetime benefactor. The trouble is, he impersonates the mad doctor too well and goes crazy himself.