Robert Shearman and Lars Pearson, in their book Wanting to Believe: A Critical Guide to The X-Files, Millennium & The Lone Gunmen, felt that Reyes ' introduction in " This Is Not Happening " was " rather forced ", finding her upbeat personality at odds with the tone of the series at that time ; Shearman and Pearson also felt that the overall use of the character in season nine was " lazy ", with her willingness to believe in anything compromising the tension of episodes such as " 4-D " or " Hellbound ".

Robert Shearman and Lars Pearson, in their book Wanting to Believe: A Critical Guide to The X-Files, Millennium & The Lone Gunmen, felt that the character was " used so perfunctorily since her introduction " that her appearances added little to the episodes she featured in, describing her as a " bad parody " of the earlier characters Deep Throat and X. Debra Warlick, writing for Cinefantastique, felt that Holden's acting in " One Son " was " heart breaking ", but found that she had " unfortunately " been used simply to convey a plot point to other characters.

Robert Shearman and Lars Pearson, in their book Wanting to Believe: A Critical Guide to The X-Files, Millennium & The Lone Gunmen, rated the episode one star out of five, and noted that " there's nothing celebratory " about the entry.

Robert Shearman and Lars Pearson, in their book Wanting to Believe: A Critical Guide to The X-Files, Millennium & The Lone Gunmen, describe Kersh's return in the eighth season as " contrived but forgivable ".

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