S06E21 - Stay Tuned
Our Tara is tied to a chair and tightly gagged with a green scarf. Her tight gag is cutting her cheeks. After some time the gag is removed, and eventually she unties her hands and overpowers her guardian Lisa (Kate O'Mara). The next time we see the ladies, Lisa is tied to a chair and cleave gagged with a scarf, moaning and struggling as well.
The best scene in my opinion.