The Argentine had waited eight years for his opportunity to shine in north London, and he grasped it with both hands, helping the Gunners finish their Premier League campaign strongly and secure a record-extending 14th FA Cup.
Martinez made a strong case to replace Leno, but Arsenal ultimately decided to stick with the Germany international upon his return to full fitness, and Aston Villa wasted no time in swooping for a man who had proven he could deliver at the highest level.
Villa snapped Martinez up for £17 million (£23m) in September, leaving the Gunners short on senior backup goalkeeping options, but the club took steps to rectify the situation as swiftly as possible.