Yay Baby! There's a Number Two on Earth and He's Kicking Butt

[HAL2100]

Callum Keith Rennie is playing the role John Wakefield, serial killer on the 'Harper's Island'

I don't think that I can ever see any of the Cylons on other shows without seeing a BS:G tie-in.

[Captain Untouchable]

Rennie used to be in Due South, which I watched with a kid. I literally squealed when I found out it was the same guy.

... a manly squeal. Honest.

If you're talking about their appearences since BSG, the only one that I can think of is Helo being in Dollhouse (which I still haven't got around to seeing yet). Not really sure what you mean by a "tie-in", so I guess that may not count.

Tricia Helfer appeared in Supernatural a few years back as well; just a bit-part, in an episode called Highway 666 or something, I think. Season 2? Gah - sorry SPN fans. Please feel free to beat me for my memory failure. >_<

[HAL2100]

Harper's Island is a series on CBS where a group of people end up trapped on an island and being killed off one by one by Number Two.

[Empress Vajnraa]

You know, "Number Two on Earth" can be interpreted several ways.

[HAL2100]

You know, "Number Two on Earth" can be interpreted several ways.

There was a Number Three in Miami playing the role of Legitimate Madam on CSI:Miami the other night.