<P> Later, Scully speaks with the man . He claims he received his burns due to alien testing and that he knew Fox Mulder (David Duchovny). He further elaborates that he was sent to the FBI to retrieve certain files . Scully suspects the man is lying, but asks to examine his burns to investigate his strange claims . He notes that they are the result of an injection that failed to transform him into one of the aliens . The man claims a new conspiracy has formed after the previous one was destroyed; the new one being hidden within the government and the conspirators involved being alien . Doggett theorizes that the man is actually Mulder . Scully takes the man to her house to give him the files he seeks . Suddenly, William begins to cry, only to be quieted when the scarred man picks him up . Meanwhile, Walter Skinner (Mitch Pileggi) meets with Doggett and the two discuss the idea that the man is actually Mulder . Skinner points out the inconsistencies in Doggett's reasoning, but a DNA test is undertaken anyway . </P> <P> Scully is told by the scarred man that William is part alien and that she is being used to raise the child . Monica Reyes (Annabeth Gish) and Doggett tell Scully that the man's DNA is a match to Mulder's, but Scully refuses to believe it . While the three are talking, the scarred man quietly slips into William's room with a syringe . Though William's crying alerts the agents, the scarred man manages to sneak out of the room before they reach William . Reyes and Scully take the baby to the hospital and Doggett discovers the man's syringe . The doctor reports that William is fine except for an elevated amount of iron in his blood . In interrogation, Scully confronts the scarred man about his motives . It is revealed that he is actually Jeffrey Spender, a former FBI agent supposedly killed by The Smoking Man (William B. Davis) three years earlier . Spender is also Mulder's half - brother . Spender admits his actions were a ruse and that the syringe contained magnetite meant to make William normal . He explains that the aliens need the child in order to successfully invade the world, but now they have lost him . However, he notes that the conspirators will always pursue the child, despite what he has done . Spender says that he acted out of his hatred for his father, since the new conspiracy was created by The Smoking Man after the alien rebels burned the original group . </P> <P> Scully muses over Spender's words and decides that the only way to truly protect William is to give him up for adoption so that he may have a better life . The episode then jumps to the Van De Kamps, who tuck in their new son . William looks at his mobile but he can no longer move it telekinetically, an event which happened in "Nothing Important Happened Today". </P> <P> The story for "William" was written by former series co-star David Duchovny, series creator Chris Carter, and executive producer Frank Spotnitz; the screenplay was written solely by Carter, and the entry was directed by Duchovny . "William" marked the return of David Duchovny, in some capacity, to the series, after his departure following the eighth season finale "Existence". In fact, Duchovny makes a cameo appearance in the episode, appearing as a reflection in Scully's eye . </P>

Why did scully give william up for adoption
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