'Lie to Me' first look: Felicia Day revisits 'Dr. Horrible' triumph

Members of the Cult of Felicia Day now have even more reason to tune into Lie to Me on Monday: The Queen of all things nerdtastic and awesome not only acts, but sings!

In the episode — the drama’s fall finale — Day guests as a teacher who brings her class to the Lightman Group on a field trip, only to get stranded there when a disgruntled farmer threatens to blow up DC. In an effort to entertain/distract the little kiddies, Day’s character performs a duet with Loker (Brendan Hines).

The end result has iTunes smash written all over it. At the very least, the addictive, so-wrong-it’s-right track better be on Hines’ next album. But don’t take my word for it. Watch the scene after the jump and post your sure-to-be-glowing reviews in the comments section!