Countdown to Doomsday on
Gamma Ray Burst - #3 on the list of Doomsday threats
This bit of the film also mentions Black Holes- see a bit about "Black Holes" here :
http://www.dailymotion.com/video/xkc22_hyperspace-black-holes-preview
See more about this here:
Countdown to Doomsday (preview)
http://www.dailymotion.com/video/x12f1k_countdown-to-doomsday-preview
