...hosted, respectively, by Lucy Lawless and Tricia Helfer

https://tvline.com/2020/04/07/xena-battlestar-galactica-full-season-marathons-syfy-april/

Xena will make its Syfy debut on April 16 featuring Lawless and surprise guests. The Helfer-hosted Battlestar Galactica marathon kicks off on April 20.

I'm not seeing both of those shows listed.