I'm more powerful than the Emperor, I can overthrow him!

Yoda: I hear a new apprentice you have, Emperor. Or should I call you Darth Sidious?

Emperor: Master Yoda, you survived.

Yoda: Surprised?

Emperor: Your arrogance blinds you, Master Yoda. Now, you will experience the full power of the Dark Side!!! (unleashes lightning from hands. The lightning hits Yoda and flings him to the wall, where he temporarily passes out, before regaining consciousness)

I have been waiting a long time for this, my little green friend. HEHEHEHEHEHHEHEHHH!

At last the Jedi are no more.

Yoda: Not if anything to say about it, I HAVE!!! (unleashes the Force that flings the Emperor across the room, hitting his chair)

At an end your rule is, and not short enough it was.

(Emperor tries to run away, but Yoda blocks his path)

If so powerful are you, why run? (switches on his lightsaber)

Emperor: You will not stop me! Darth Vader will become more powerful than either of us! (switches on his lightsaber)

Yoda: Faith in your new apprentice, misplaced may be, as is your faith in the Dark Side of the Force.

(Yoda jumps forward and attacks the Emperor, and so begins the battle between the 2 heads/leaders of their respective Orders)