The Flash, Season 1

Wells:
You're incredibly clever, Cisco. I've always said so.

Cisco:
You're him. The Reverse-Flash.

Wells:
You and I haven't been truly, properly introduced. I am Eobard Thawne.

Cisco:
Thawne? Like Eddie.

Wells:
Let's call him a distant relative.

Cisco:
The night that we trapped the Reverse-Flash, you almost died. There were two of you.

[Wells uses his speed powers to create two images of himself.]

Wells:
It's an after-image. A speed mirage, if you will.

Cisco:
Joe was right. You were there that night, 15 years ago, in Barry's house. You killed Nora Allen.

Wells:
It was never my intention to kill Nora. I was there to kill Barry.

Cisco:
Why? You're his friend. You've been teaching him how to...

Wells:
Go faster. I know. A means to an end. And I'll tell you why. Because I have been stuck here, marooned here, in this place for fif-teen long years. And the Flash, and the Flash's speed, is the key to my returning to my world. To my time. And no one is going to prevent that from happening.

Cisco:
I can help you.

Wells:
You're smart, Cisco. [starts vibrating his hand] But you're not that smart. Do you know how hard it has been to keep all of this from you, especially from you? Because the truth is, I've grown quite fond of you. And in many ways, you have shown me what it's like to have a son. [thrusts his vibrating hand into Cisco's chest] Forgive me. But to me, you've been dead for centuries. [removes his hand, and Cisco falls to the floor dead.]