Decision time is approaching:shock::shock:One way to end an alien invasion: cancellation

During the week of May 17th, the major broadcast networks will announce their fall primetime schedules, at which point they will also reveal the fates of any existing shows that haven't yet been renewed or canceled. Many programs — from first-year hits likeModern Familyto veterans such asSurvivor— have already received word that they'll be back in the fall, while others (like Fox's24and ABC'sUgly Betty) are officially ending this season. But that leaves a number of programs in limbo over the next few weeks as they await an official announcement.

ABC's biggest bubble shows are sci-fi serialsVandFlashForward, while the uncertainty at CBS chiefly revolves around its comedy lineup, which could see a shakeup in the fall. At Fox,Human TargetandLie to Meface uncertain futures, while the fate of the CW's newLife Unexpectedis the biggest mystery there. (Many experts believe thatLifeis competing againstOne Tree Hillfor the network's final open slot.) NBC's major question mark isHeroes, which recently completed its most poorly-rated season to date and seems unlikely to return. Fellow Monday night seriesChucklooked like a sure thing for renewal after its strong start this year, but has been shedding viewers over the past month and now could be in trouble.