A supernatural glitch in your DVR occurs. At first you panic, hitting lots of random buttons on your remote control, but then are RELIEVED to discover that no, your entire series recording of Golden Girls has not been deleted! But then, just as things appear to be back to normal, there's a puff of smoke, and a fairy appears! You have apparently freed the TV fairy from a televised hell in which she was made to watch endless reruns of Are You Hot?, and as fairies tend to be when freed, she is very grateful and wants to grant you magic wishes.
Now, the fairy has only TV-related powerz, and so she offers you the chance to go back in time and retroactively CHANGE the history of your favorite TV shows with 3.5 wishes!
You can go back in time and erase from the fabric of TV history THREE individual episodes of any TV show you want! The rest of the series(es) will not be altered. What do you choose?
1: Angel S5, The Girl In Question. Funny-ish, but totally wrong for everything that came before and after it.
2: Doctor Who 10th doctor: New Earth - totally derivative and a rotten start to the series.
3: Star Trek original series S3: Let That Be Your Last Battlefield - because it's appallingly bad, the worst episode of a fairly shaky season.
You can go back in time and revive ONE unfairly cancelled television show and return it to the annals of TV history!* *CHOOSE WISELY, because if you attempt to revive more than one show, the wish will backfire and you'll instead be treated to a whole bunch of crappy made-for-TV "reunion" movies full of replacement actors.
Has to be Firefly, I think.
To balance out the historical TV viewing schedule, you now have the power to retroactively CANCEL, at any point during the series, any one show! Alternately, you can wield your destructive might and DELETE one whole entire series from ever having been made.
Big Brother, in its entirity - preferably by the public hating it so much that nobody ever makes anything like it again. Come on, why settle for any lesser evil?
LIFE AND DEATH! You can now bring ONE character back from the dead... and, to restore the balance, you must also kill off a character! They don't have to be from the same fandom.
Bring back Cordelia Chase (Angel) but kill Andrew Wells (Buffy). Sacrificing Andrew to raise Cordy works for me...
Bonus tradeoff: you can delete a single scene, relationship pairing or plot arc from any series that gave you hives... AND you can plug in any one [scene, pairing, plot arc] that you never got to see!
Take Willow/Kennedy (Buffy) and plug in Willow/Faith. What can I say, I'm shallow...
Later thought: Actually, I'd settle for reviving Wonderfalls or Dead Like Me if Firefly wasn't available.