He would be doing more dastardly deeds soon enough.

How long would she have to watch him doing his dastardly deeds?

"How does it help you to do dastardly deeds?"

I just want to stop you from doing dastardly deeds.

How naïve they had been; dastardly deeds were the most fun.

Then there would be no one stopping her from doing ever more dastardly deeds.

Even a pirate should know where to draw the line in dastardly deeds.

Whoever used it would do some dastardly deed before the next full moon.

"Those soldiers will do some dastardly deed to us if we don't get away from here fast," she pointed out.

He says they were going to do the dastardly deed.