How I Met Your Mother New episode preview: Doogie Howser grows a beard

You could never accuse "How I Met Your Mother DVD" of being particularly forthcoming with its preview images.

The Jan. 3 episode, "Bad News," finds Marshall (Jason Segel) and The Twilight Zone Seasons 1-5 DVD Lily (Alyson Hannigan) heading to a fertility expert played by guest star... Neil Patrick Harris.

Yes, NPH gets a double billing, playing Barney and "Dr. Stangel." But is this a joke or another doppelganger? Either way, it's a step in the right direction for the pregnancy-challenged couple.

The real question at this point is which of the two is causing the hold up.How I Met Your Mother Seasons 1-5 DVD Judging by facial expressions, we're going with Lily.