Seth and Simon in “Unfinished Business”

Seth

Kelly said you wanted to see me.

Simon

I need Curtis's old power.

Seth

I put it in my iguana. He's dead. The power's gone.

Simon

I have to go back in time. It has to be like this.

Seth

Right, well... There is another time travel power out there. I sold it to this guy. It's different to what he had. There's no coming back.

Simon

Who did you sell it to?