Plot: Ellen dives into iconic TV sets, visiting "The West Wing" for a behind-the-scenes tour and an arm-wrestling match with Alison Janney, "Two and a Half Men" for laughs with Charlie Sheen and a surprising ballet move from Angus T. Jones, "ER" to quiz Maura Tierney and Goran Višnjić while pitching her dream role, "Joey" to chat with Matt LeBlanc about reviving Joey Tribbiani, and "Gilmore Girls" to explore Stars Hollow with Lauren Graham and Alexis Bledel, reminiscing about the gazebo scene