The "NCIS" star surprised Ellen on the final day of Mark Harmon Week. Watch what happens when television's top two personalities appear together on the same show!
Mark Harmon Celebrates Mark Harmon Week! ─ TheEllenShow
<style>.embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }</style><div class="embed-container"><iframe src="http://www.youtube.com/embed/IQwZq2HtYcs" frameborder="0" allowfullscreen></iframe></div>
