Watch: Dale Earnhardt Jr. meets clueless replacement in new ad

Mountain Dew is bidding farewell to Dale Earnhardt Jr. with a hilarious new ad featuring his replacement, "Dewey Ryder," played by actor Danny McBride.

Despite knowing virtually nothing about racing, Ryder is all too eager to take over the No. 88 car when Earnhardt retires at the end of the season.

The commercial will make its television debut during Earnhardt's second-to-last race Sunday in Martinsville and during Game 5 of the World Series.