Ooh, actually, if you don't mind, it's just "The Doctor"
Doesn't even really matter who. Who am I even talking to? Oh yes, you!
The wannabe Einstein, minus the 'stache
Travels through time but with no class
I'm saving the world while you dilly-dally
You can't even invent a way out of Hill Valley!
And calm down, will you? Everything is going to be fine!
You're not going to tear any wonky holes in any fabric of space and time
Actually, it's a lot more like [bad word] really, oh, well, never mind
Let's just say there's an infinite number of me simultaneously kicking your [bad word] with rhyme!

Great Scott! You're great... not! I spit it hot
Then generate way more power than 1.21 gigawatts
I'm not sure what sort of scientific authority you purport to be
But I'm a real doctor! Where'd you get your degree?
Despite all [bad word] you couldn't be having less 
I don't know what's lamer, your fans or your special effects!
You don't get another turn to debate, time to face your permanent fate!
Now Dalek my balls! Exterminate!

I'm a mystical medical doc at the pinnacle shifting my physical form
You're a possibly pedophilic individual who should have never been born!
You got your knickers in a twist while you're sucking on my Piccadilly
But I'm a lot lot different
Cause you're a pitiful hillbilly hangin' with an oedipal kid who's a bawk bawk chicken!

Nobody calls me chicken!

This is between us, Scarfy, don't try to out-rhyme me
You'll find I'm as grimy as any slimy time-limey
I'll use your port-o-potty time machine as my latrine
You're not a cat with nine lives, you're a [bad word]  with thirteen!!