I think it's from seas.3 "Tempus anyone?", but I'm not sure I recall all the quote...hem, let's give it a try:

"Clark: I'm sorry, I just, I just --- -- bit of trouble believing all of this.

Lois: What? That Tempus is a bandit? That he's H.G Wells? Or that we're from a parallel Metropolis?

Clark: No, that this other me flies around in
tights.

Lois: Your mother made them for you."

...How bad am I?

Carole smile1