Underwood appeared on "How I Met Your Mother" in March 2010. She played the role of Tiffany, a medical sales rep that forms a relationship with Ted. This was the second highest rated episode for season five, gaining 10.48 million viewers. Brian Zoromski of IGN gave the episode 8.5 out of 10. He was surprised how well Underwood performed in her first acting role. A few months earlier, she appeared in an episode of the PBS children's television series "Sesame Street", performing a voice-over as "Carrie Underworm" a worm who sings a song about worm pride before an auto race Sesame Street is holding.