MEGADETH bassist David Ellefson has posted a four-minute video clip featuring behind-the-scenes footage from the band's December 7 concert at Fox Theater in Pomona. Check it out below.According to Ellefson, the Pomona show was professionally filmed for possible future release. The 20th-anniversary edition of MEGADETH's 1992 double platinum-certified "Countdown To Extinction" album was released on November 6 via Capitol/EMI. Presented in a 2CD lift-top box and digitally, "Countdown To Extinction"'s new commemorative edition pairs the remastered original album with a 1992 concert, recorded live at San Francisco's Cow Palace, which has never before been released in its entirety. The concert audio has been newly remixed for this release. The physical and digital versions both include a booklet with a new liner notes essay by music journalist Kory Grow, and the 2CD box also contains a 24" x 36" poster and four collectible postcards. MEGADETH is currently performing the acclaimed album in its entirety on the band's "Countdown To Extinction 20th Anniversary Tour".