Zlata is Stewie's Ukrainian mail-order bride in "The Marrying Kind".
When Stewie becomes taken with Mort's wedding ceremony to Rachel, he orders a mail order bride from Ukraine who arrives with her half-eaten sister to ensure that at least one survived. To support his new bride, he takes a job with Enterprise Rent-A-Car, where, thanks to a deadbeat employee, he finds himself stuck with some of the dirtiest jobs.
With Stewie resistant to her demands for sex, she takes up sleeping with Brian. Discovering them in bed together, he takes a baseball bat to Brian's car before breaking down in tears. Realizing a solution to his problem, he pretends over a dinner with Brian to still be angry while suggesting that he can continue having sex to keep her distracted, although she leaves him anyways.