Mutated cold virus Appearances Mentioned Effects Victims Perpetrator Solved A mutated cold virus was featured prominently in the episode "Bound". The Mutate Cold Virus is what Peter, Walter, and Olivia describe as, Walter: "This organism is a single specimen of a virus for the common cold." Olivia: "So you're saying that this is one single cell?" Walter: "It's not unprecedented. The ostrich egg is a single cell, and it can grow up to five pounds." Peter: "They supersized the common cold, which, as it turns out, is disgusting." Olivia: "Obviously somebody's playing with us."