the point of view of 'I'm Jack Harkness and I'm right'." For Lynnette Porter, Jack's actions in the serial make him "a benchmark for [morally] grey heroes"; some audiences may even view him, in light of his actions, as "villainous or downright monstrous." Although Jack ultimately saves the majority of the world's children and finds a way to foil the monstrous 456, the situation in which he is placed forces him to make a morally difficult (and to some viewers, reprehensible) decision. Such, Porter argues, is the mark of a grey hero. Davies stated in an interview with SFX that he "loved" the uproarious reaction to Jack's actions, defending the character in saying "He saved every single child in the world! If you would fail to do that then you’re the monster, frankly. It’s this extraordinary treatment that only science fiction heroes get." When Jack is departing Earth, the music playing is titled "Redemption", signifying that his departure is also perhaps his redeeming act in the serial. Face of Boe Russell T Davies referred to a scene in "Last of the Time Lords" as promoting a theory that Jack may one day become recurring character "the Face of Boe"a large, mysterious disembodied head in a glass case, the oldest creature in the known universeas a consequence of Jack's immortality and slow aging (surpassed by Ashildr / Me). The Face of Boe first appeared in the 2005 episode "The End of the World", watching the final destruction of the long-abandoned Earth by the expansion of the Sun in the Earth year 5,000,000,000; Boe appears in two other episodes, "New Earth" (2006) and "Gridlock" (2007), and is mentioned in other episodes, such as his being "the oldest living creature in the Isop Galaxy" as of the Earth year 200,100, per "Bad Wolf" (2005). Barrowman described himself and David Tennant as being "so excited" to the extent where they "jumped up screaming" when they read Jack's line regarding the Face of Boe, remarking "It was probably the most excitable moment we had during the shooting of that series." The Face of Boe had originally been a throwaway line in a script for "The End of the World"; because creating the character seemed expensive, the Face of Boe was nearly discarded and replaced. However, special effects designer Neil Gorton loved the idea and pushed to make sure the character lived. Davies loved Gorton's design