Great, isn't it? One of the very few cards to reference other expansions in any way at all.

King In Yellow has "Another Place, Another Time," in which a monster appears at every gate to Another Dimension and Another Time.

Tibs said:

Yeah, but it isn't exclusive to Dunwich... I'm surprised. Are there more cards like these?

kroen said:

Technically, neither is Time After Time, as only the line about the gate requires Dunwich. As to other cards, I can't help you.

There's a Mythos card from King in Yellow called Repairer of Reputations where investigators may meet with Mr. Wilde and discard a curse, bank loan, or detriment ; or may come back from being jailed... for a price

The Handcuffs from Kingsport work on Tcho-Tchos, which are only found in the Dunwich expansion. They don't work on Tcho Tcho prist from the same expansion they appear (this could cause much confusion for patrons who have not seen the Dunwich expansion).

I can't think of any more off my head, and I haven't seen all the encounters, so there's likely many more out there.

Bah, that card blew the seal moments after I sealed the gate in my last game, sucking my investigator back in. Like the design though :-)

Tibs said:

That is awesome. I always thought expansions refer exclusively to themselves and the base game. Also, the handcuffs saved me a couple of times against Tcho-Tchos where my regular weapon just wasn't strong enough.