HOW I MET YOUR MOTHER
CBS, 8:00 p.m. ET
Buffy the Vampire Slayer fans will get a special kick out of tonight’s episode. Its guest star is Seth Green, who, back on that clever cult series, played werewolf Oz, the boyfriend of witchy Willow – played by Alyson Hannigan (seen, with Green, in her Buffy days), now co-starring on Mother as a new mother.