Como o Doctor conseguiu o Capitão Janeway e Tom Paris de volta ao humano em “Threshold”?

O médico usou terapia anti-próton para apagar todos os vestígios do DNA mutante do sistema deles.

EMH: I believe the answer lies in forcing his DNA to revert to its original coding. Once that occurs, his body should return to its former state. 

CHAKOTAY: How do we do that? 

EMH: We destroy all of the new DNA in his body. His cells will have to use the original coding as a blueprint. But the only way to destroy the mutant DNA is with highly focused antiproton radiation.

Mais tarde

EMH: I've eradicated all traces of the mutant DNA from your system and restored your original genome. Congratulations. You're human again. 

No universo, de Memória Alfa

Paris and Janeway are reverted back to their Human selves using The Doctor's anti-proton treatments, although Paris is extremely embarrassed about having mated with the captain.

ou seja, era mágica.

Brannon Braga named this episode as the one installment from the entirety of Voyager that he would "just as soon forget" and remarked, "That's a real low point [....] It really backfired on me. It was poorly executed by me."

_{1 E, para ser justo, eles fizeram muito melhor para o resto das sete temporadas da Voyager.}