G4 is cancelling " Attack of the Show !" and " X-Play ," two giddily nerdy shows that helped define the network. Both shows will end production at the end of the year after 1,700 episodes of "Attack of the Show" and 1,300 episodes of " X-Play ." "Attack of the Show!," perhaps best known for launching the career of former host Olivia Munn , has focused since its 2005 debut on technology, games, pop culture, movies and videos. Candace Bailey and Sara Underwood now host. The gaming-obsessed " X-Play " debuted in 2003 on G4's previous incarnation, TechTV. It is now