When Tony opens a mysterious letter thinking it's for him, a small puff of white powder comes out and releases a possible deadly virus. Soon Kate and Tony are isolated in a bio-hazard isolation room for precaution. McGee and Gibbs work to discover who sent the envelope and how to cure their friends before it's too late for them.
| Creator | Don McGill |
|---|---|
| Actor | Sean Murray, Wilmer Valderrama, Katrina Law |
| Country | United States of America |
| Production | Paramount Television |