On 11 August 2010, Cathcart signed for Blackpool for an undisclosed fee, after agreeing a three-year contract, with an option for a further year. Three days later, he made his debut as Blackpool marked their Premier League debut with a 4–0 win over Wigan Athletic at the DW Stadium. He scored his first goal in the Premier League with a powerful header against his former club, Manchester United, at Bloomfield Road on 25 January 2011; the 15th-minute goal opened the scoring for the match, but Blackpool went on to lose 3–2.
