Returned: March 17 (airs Mondays at 8:30 pm/ET, CBS) Number of new episodes: 7 Where we left off: Ted (Josh Radnor) was adopting caddish ways - including a one-night stand with ex Robin (Cobie Smulders). Marshall (Jason Segel) and Lily (Alyson Hannigan) had apartment-buyer's remorse. Barney (Neil Patrick Harris) got his mojo back. What's next: Ted gets closer to meeting the mother of his kids. And expect more guest stars. Now that Britney's appeared, will Lindsay Lohan be next? Mr. Nice Guy returns: Ted is turning "back into the guy we fell in love with," promises cocreator Carter Bays. "We wanted to see him go through the dark period. Now we get to go back to telling the story we love to tell." Watch full episodes | Photos | More Returning Favorites coverage