| Coke's competitor to Pepsi's Mountain Dew |
| Baseball's reserve clause challenger |
| Coke vis-à-vis Pepsi |
| Political challenger's promise |
| Louis challenger |
| America's Cup challenger |
| Alternatives to Pepsis |
| Polygraph challenger |
| Twice-beaten Joe Louis challenger |
| Tab challenger of 1982 |
| Writer who created Professor Challenger |
| One-time Clinton challenger |
| Challenger to Trump in 2016 |
| A challenger |
| Apt challenger of this puzzle's circled locations |
| Like Coke and Pepsi |
| Do a post-Challenger diagnosis |
| DDE's challenger |
| St. George's challenger |
| Creator of Professor Challenger |
| Triple dog" challenger |
| Alternative to Coke Zero or Pepsi One |
| Be a challenger |
| Dwight's challenger |
| IRS audit challenger |
| Tortoise challenger |
| Challengers. |
| Pepsi-___ |
| PepsiCo repackaged frozen treats (3,4) |
| NSA wiretap challenger |