On March 20, 2009, "SmackDown" celebrated its 500th episode. On September 15, 2009, WWE Home Video released a DVD set entitled "The Best of SmackDown 10th Anniversary". The "SmackDown" 10th Anniversary DVD which included the Top 100 moments in "SmackDown" history was hosted by Cole and Matt Striker. On April 19, 2010, the eruption of a volcano in Iceland left ash hovering over Europe and caused the grounding of many flights, leaving most of the "Raw" roster stranded in Belfast, Northern Ireland. To keep the audience from thinking that "Raw" was canceled for the night, "SmackDown" wrestlers (including Rey Mysterio, Edge, CM Punk, Chris Jericho) took over "Raw". The episode is known as "Monday Night SmackDown", although that title was never mentioned on air. On October 30, 2009, Todd Grisham was revealed as the new lead announcer for "SmackDown", alongside Michael Cole for one night on October 16, 2009, and Matt Striker, a position he held until December 3, 2010, when he left to become the new lead announcer for "NXT" along with Josh Mathews.