Discover the enduring friendship between television personality Dick Cavett and his mentor iconic comedian Groucho Marx. Their relationship is chronicled through interviews with Cavett, archival footage and interviews with George Burns and others.
| Actor | Role |
|---|---|
 Dick CavettSelf | Self |
 Groucho MarxSelf (archive footage) | Self (archive footage) |
 Jack PaarSelf (archive footage) | Self (archive footage) |
 E.Y. HarburgSelf (archive footage) | Self (archive footage) |
 Woody AllenSelf (archive footage) | Self (archive footage) |
 Shelley WintersSelf (archive footage) | Self (archive footage) |
 Dan RowanSelf (archive footage) | Self (archive footage) |
 Phyllis NewmanSelf (archive footage) | Self (archive footage) |
 Truman CapoteSelf (archive footage) | Self (archive footage) |