 The most romantic of all the Tracy brothers, Alan is involved with Tin-Tin, the daughter of Kyrano, caretaker of Tracy Island.However, despite his passion for her, he is seen to be attracted to IR's London agent, Lady Penelope Creighton-Ward, in the episode "The Perils of Penelope" and the film "Thunderbirds Are Go".Zimmerman has spoken warmly of Alan's conception and development, commenting that "Alan was the one character that showed emotion.