A grease monkey discovers a defect in an auto engine being turned out by his employer. But since our hero discovers this only after losing an important race, his boss chalks up the loss to Fairbanks' supposed cowardice.
| Actor | Role |
|---|---|
 Douglas Fairbanks Jr.Vernon Keith | Vernon Keith |
 Sally BlaneEthel Hume | Ethel Hume |
| CCharles ByerGeorge Marshall | George Marshall |
| AArthur MetcalfeFergus Hume | Fergus Hume |
 Kit GuardGoof Goober | Goof Goober |
 Byron DouglasBenton | Benton |
 James Pier MasonDerne | Derne |
 Joel McCreaUndetermined Secondary Role (uncredited) | Undetermined Secondary Role (uncredited) |