Lieutenant Paris makes history by becoming the first person to make a transwarp flight. But, soon after his shuttle returns from Warp Ten, he undergoes startling biochemistry changes. His cell membranes begin to degrade and, despite the Doctor's best efforts, Paris dies. Hours after the pronouncement of death, Paris is discovered breathing, his body going through accelerated mutations which leave him radically transformed into a bizarre and terrifying cross between a human and amphibian.

Raphael Sbarge (Crewman Michael Jonas)
Mirron E. Willis (Jal Rettik)

• Jonas contacts Rettik and transfers the transwarp data to him to prove that he is serious about contacting Seska.
  
• Paris kidnaps Janeway and launches the shuttle. When the crew finds them, they are both mutated into amphibian creatures. They have also mated and produced offspring. The Doctor finds a way to eliminate the mutant DNA to return them to normal.