InterCasino, which has been around since 1996, has taken on five agencies to relaunch the site as the 'undisputed king' in its sector by boosting customer loyalty.
Unity will focus on online PR and digital, working closely with other new appointees such as creative agency Isobel and branding agency Michael Peters & Partners.
Co-founder Nik Done, who will lead the account, said: 'In terms of tactical delivery we are primarily focusing on online PR globally, but we are also working on core ideas that can work across all marketing elements. Many competitors have joined the market in recent years, but this huge marketing push will leave no doubt in consumers' minds as to who's the daddy.'
One of Unity's initial online PR ideas is to offer disgraced MPs the chance to win back the money they had to repay after the expenses scandal.