| 0 | - | cover | 1 | | Underdog |
| 1 | Underdog Summer Special | credits, title page | 1 | letters: typeset | Underdog |
| 2 | The Phoney Booths (Part 1) | comic story | 5 | pencils: Frank Johnson; inks: Frank Johnson | Underdog; Sweet Polly Purebred; Simon Bar Sinister; Cad |
| 3 | The Phoney Booths (Part 2) | comic story | 5 | pencils: Frank Johnson; inks: Frank Johnson | Simon Bar Sinister; Cad; Shoeshine Boy [Underdog] |
| 4 | The Phoney Booths (Part 3) | comic story | 6 | pencils: Frank Johnson; inks: Frank Johnson | Underdog; Simon Bar Sinister; Cad; Sweet Polly Purebred |
| 5 | The Phoney Booths (Part 4) | comic story | 6 | pencils: Frank Johnson; inks: Frank Johnson | Underdog; Sweet Polly Purebred; Cad; Simon Bar Sinister |
| 6 | The Marble Heads (Part 1) | comic story | 6 | pencils: Frank Johnson; inks: Frank Johnson | Sweet Polly Purebred; Shoeshine Boy [Underdog] |
| 7 | The Marble Heads (Part 2) | comic story | 6 | pencils: Frank Johnson; inks: Frank Johnson | Underdog; Sweet Polly Purebred |
| 8 | The Marble Heads (Part 3) | comic story | 5 | pencils: Frank Johnson; inks: Frank Johnson | Shoeshine Boy [Underdog]; Sweet Polly Purebred |
| 9 | The Marble Heads (Part 4) | comic story | 6 | pencils: Frank Johnson; inks: Frank Johnson | Shoeshine Boy [Underdog]; Sweet Polly Purebred |
| 10 | Gummed Up | comic story | 3 | script: Phil Mendez; pencils: Phil Mendez; inks: Phil Mendez | Fatdan; Bobbin |
| 11 | Color Us Up High | activity | 1 | | Sweet Polly Purebred; Underdog |
| 12 | Sid Bits | promo (ad from the publisher) | 1 | script: Sid Jacobson | |
| 13 | - | letters page | 1 | letters: typeset | |
| 14 | Fasten Your Seat Belts | promo (ad from the publisher) | 1 | | |