The #WithoutLimits campaign sees a short film run across YouTube, Facebook, Twitter and Instagram featuring Aitch.
Shoppers can also get their hands on a limited edition Aitch x Relentless Origin 500ml can, featuring an on-pack competition to win a day out with Aitch or merchandise.
Martin Attock, vice-president of commercial development at Coca-Cola Europacific Partners, said: “Our energy drinks brands have continued to grow over the past twelve months – up 30% in value and performing ahead of the market to increase our share of the segment to almost 31%.
“Worth £43m and in growth year to date, Relentless is key to our portfolio and has been powering experiences in music for more than a decade.
“That’s why partnering with one of the top artists on the UK rap scene is something that we know will resonate well with fans of the brand.
“Combined, our #WithoutLimits campaign and on-pack promotion will drive even more shoppers into stores for a can of Relentless, especially as the on-the-go mission continues to pick up – and we’re urging retailers to take advantage.”