After training in Florida, Invasor was sent to Dubai to compete in the UAE Derby, running into traffic problems but coming on again to end up only a half length behind the 3rd and 2nd horses, albeit far from the winner, Discreet Cat (owned by the competing Godolphin Stables). Returning to the United States, he returned to the track in May to win the Grade I Pimlico Special by 1¼ lengths over Wanderin Boy, after stalking the leader through most of the race. On July 1, Invasor won the Grade I Suburban Handicap by 4 lengths at Belmont Park. On 6 August, he won his third straight Grade I race, holding off a hard-charging Sun King to win a photo finish in the Whitney Handicap at Saratoga. Invasor was pointed to the Jockey Club Gold Cup but developed a fever a week prior to the race, so his trainer decided to skip it and point him to the Breeders' Cup Classic to be run in November 2006.