When was the Thinker originally begun ?
Later , with his Triumvirate of Terror ( consisting of Piledriver , Hammerhead , and Thunderboot ) , he captured the Avengers , and invaded Avengers Mansion , believing that he had successfully overcome them by remembering to take advantage of the human element of his enemies ' personalities that he had forgotten in the past , but he was nevertheless foiled by the unexpected intervention of Hercules , who had only recently begun to stay with the Avengers following his exile from Olympus .