|Full Name:||Tessa Williams|
|Portrayed by:||Hilary Jardine|
|First appearance:||"No Place Like Home"|
|Latest appearance:||"West Side Story"|
Tessa Williams is a recurring character in Season 3 of CBS' Zoo. She is Jackson Oz's girlfriend helping him escort people out of the hybrid zone. After finding out Jackson's true identity she leaves him, but later joins the team to help combat the hybrids. Her ultimate goal in life is to be a mother, and is struggling to deal with the fact it might not happen due to humanity being sterilized by the TX gas.