Amy Rose and Blaze the Cat were on vacation in London and then they saw Tails and Cream there too.

Amy Rose: Cream? Tails?

Blaze: What are you doing here?

Tails: What are you doing here?

Cream: Yeah. We thought you were having Opal and Ruby.

Amy Rose: We thought you had them.

Tails: Wait. If none of us have the twins, where are they?

Blaze: Oh no. Shadow is gonna kill us if he knows his daughters are gone!

Cream: What are you gonna do?

Tails: Wait. Don't panic. I know who to call. Tails pulls out his phone and dials a number. Hello? We need help. We're in London and we lost Shadow's . Get here as soon as you can. Tails hangs up.

Amy Rose: Who did he call?

Blaze: Beats me.