Dennis Duffy is the eccentric and mostly terrible, sometimes boyfriend to Liz Lemon. He is played by Dean Winters. Liz had dated him most recently in season 1 ("Jack Meets Dennis," "Tracy Does Conan" and The Break-Up). Liz's pros and cons list deciding her future with Dennis was ultimately tipped to the negative after she found out he had tried to have sex with a minor.
- Dennis plays Halo under the pseudonym "Slut Banger."