Coca-Cola Co.’s Powerade is unveiling a new weapon in its battle against PepsiCo’s Gatorade: Seattle Seahawks star Jimmy Graham. And quite possibly, Al Pacino.

Mr. Graham stars in a new ad called “Churn,” continuing Powerade’s “Just a Kid” campaign that began with an ad earlier this year starring Chicago Bulls star Derrick Rose. The new spot compares Mr. Graham’s tough upbringing to a “mouse who finds himself drowning in a bucket of cream.” Scenes include references to a state-run group home in North Carolina where Mr. Graham spent time as a kid and was “confronted by violence, intimidation and despair,” according to the brand.

The voiceover sounds very much like Mr. Pacino, although a Coca-Cola spokeswoman declined to identify the voice.