Considering there's really nothing serious about it -- some of the enemies have bombs for heads -- we're not sure how Serious Sam wound up with its name. It could be comic irony, or perhaps merely for its delightful sibilance. Honestly, we may never know. What we do know is that Serious Sam HD: The First Encounter is this week's XBLA release, as promised last month. Sporting newly fancified graphics, online co-op and some serious action (oh that's it!), the game will be available for 1200 ($15).