Cornelius Peter

When Ted fills in as Marvin's nanny, Marshall and Lily realise he's using the baby as a surrogate for the real object of his devotion: the GNB building; Robin is determined to get Barney back, no matter what it takes.

Sick of her intrusions on his FaceTime dates with Max, Randy sets Caroline up on a date with one of his co-workers. Sophie tells Oleg to sell his car and upgrade to a minivan, causing him great distress.

Lyle and Erik display different behaviours after their loss. Lyle remains stoic, while Erik is grief-stricken. Evidence suggests that Lyle and Erik may be responsible for the killings.