Being bored. Do I have to stop hanging out with Zoey? Lily: No, you just need to spend time with her and The Captain together. Marshall: Whoa, he hates them. Robin: Yeah. She lied to her husband? Ted: We can. That's what Barney and Lily were fighting about! The Mermaid Theory!
Plan: A: Ted; Q: Who invites The Captain to hang out with them? A: Zoey; Q: Who does Ted make a new friend with? A: single men; Q: What type of men and married women can't be friends? A: her husband; Q: Who does Ted invite to hang out with him and Zoey? A: Marshall; Q: Who and Robin decide to spend time together? A: a fight; Q: What could Barney and Lily possibly have? Summary: When Ted's new friendship with Zoey tests the theory that single men and married women can't be friends, he invites her husband, "The Captain," to hang out with them. Meanwhile, Marshall and Robin decide to spend alone time together, and Barney and Lily possibly have a fight.