I'm just trying to show you
Just how well I know you
I understand just how you feel
Threw your reason away
Cause you had one bad day
And your mind let go of the wheel
Still we're fated to battle
You pout and I prattle
Don't you ever tire of this game?
But you'll not make it end
'Cause I'm your only friend
We are opposites but we're the same!
We are two of a kind
Violent, unsound of mind
You're the yin to my yang, can't you see?
And if I were to leave
You would grumble and grieve
Face it, Bats...
You'd be lost without me!
Though I do admit it came on fast,
Still I do believe that it can last
And I will be loathing, for forever, loathing, truly deeply loathing you,
My whole life long
— Galinda and Elphaba, Wicked, "What Is This Feeling?"
What you call an infinite brawl, eternal souls clashing
War gets deep, some beef is everlasting
— Nas, "One Mic"
"Every fairy tale needs a good old-fashioned villain. You need me, or you're nothing. Because we're just alike, you and I - except you're boring."
— James Moriarty, Sherlock
"You know, I used to think it was our families that made us who we are? Then I hoped it was our friends. But if you look at history, the great men and women of the world have always been defined... by their enemies."
Lisa: Bart, your mortal enemy's on the radio! (Turns radio on)
Radio: It's time for more deeeeeeee-mentia, with Dr Demento!
Bart: AAAAAAGGGGH! (Throws radio out the window)
Lisa: ...I meant your other mortal enemy, Sideshow Bob.
->Bart: Sideshow Bob? (Groan) I'm only ten, and I already got two mortal enemies!
The Joker: Oh, you. You just couldn't let me go, could you? This is what happens when an unstoppable force meets an immovable object. You truly are incorruptible, aren't you? You won't kill me out of some misplaced sense of self-righteousness. And I won't kill you because you're just too much fun. I think you and I are destined to do this forever.
Sideshow Bob: Rakes! My old arch-enemy.
Bart: I thought I was your old arch-enemy.
Bob: (sniffs) I have a life outside of you, Bart.
BWAHAHAHA! Not bad! I guess I chose the right guy to be my arch enemy. At least you always put up a fight.
— Bowser, Super Mario Galaxy
Can't believe you think he's my boss, he's my archenemy!
— Manny Calavera, Grim Fandango
"You can always judge a man by the quality of his enemies."
—The Seventh Doctor, Doctor Who, "Remembrance of the Daleks"
Amy Pond: So, you have enemies, then.
The Doctor: Everyone's got enemies.
Amy Pond: Yeah, but mine's the woman outside Budgens with the mental Jack Russell. You've got, you know, arch-enemies.
"Do you know what "nemesis" means? A righteous infliction of retribution manifested by an appropriate agent; personified, in this case, by an 'orrible cunt... me."
— Brick Top, Snatch
"Lord Monkey Fist, my arch-foe! Hey, I just realized I have my own personal arch-foe. It's kind of cool."
— Ron Stoppable, Kim Possible
"No, no, I'm not gonna kill him. We need each other. We define each other. We're... yin and yang, black and white."
— David Allen Griffin, The Watcher
Ages ago Set coiled about the world like a python about its prey. All my life, which was as the lives of three common men, I fought him. I drove him into the shadows of the mysterious south, but in dark Stygia men still worship him who to us is the arch-demon. As I fought Set, I fight his worshippers and his votaries and his acolytes.
Doctor Venture: You just have to keep pushing my buttons, don't you?
The Monarch: I'm your arch enemy! That's what I do! That's my thing!
In the first twenty minutes of EarthBound, we learn most of what we need to know about Pokey: he's a slobbish, dishonest, immature, self-centered coward. Meanwhile, we hear everyone around Onett tell Ness what a brave, smart, honest, and all-around excellent person he is. Pokey is something of an anti-Ness; he is everything that Ness is not, and perhaps in equal proportions.
Try as we might, we in the end have to return to the theme we saw playing out in the opening stories of the series: that the show becomes Doctor Who proper once four concepts are in place. Those concepts are the Doctor, the TARDIS, the companions, and the monsters. And The Daleks are the ones who establish what monsters are. They are the ones to set up one of the tentpoles of the series, and in one sense every other monster in the series is just an expansion or a variation on something the Daleks do in the original Nation or Whitaker stories. The Cybermen are the Daleks with unfeeling extermination turned up to eleven, the Ice Warriors are just a variation on the small core of Daleks struggling to survive, and the Silence are just Whitaker's alchemical Daleks for a new generation. Even the Master is just a sexier version of the Dalek shouting "I AM YOUR SERVANT" in Power of the Daleks.
Hobbes, we have lots of mortal enemies! If this club only had one mortal enemy, then where would we be? Where would Superman be if he only had one super villain trying to take over the world every other day? Where would Spider-Man be if there was only one weirdo out there who managed to find enough time in his day to moonlight as an evil lunatic? Where would Batman be if all he had to do is defeat one highly unrealistic villain in order to save... whatever it is he aims on saving? I mean, come on!