Josh Radnor, Neil Patrick Harris and Cobie Smulders

On Jan. 27, CBS's How I Met Your Mother airs its 200th episode, titled "How Your Mother Met Me," which promises to fill in several details involving the titular parent. "Various claims we've made about the mother over the years — like her making breakfast and singing show tunes — will be paid off," promises cocreator Craig Thomas.

But while some of the mysteries surrounding Ted's wife may get solved, the cast members have some questions about their own characters, as well as storyline wish lists, that they're anxious to have addressed before the series wraps this spring. Thomas and cocreator Carter Bays respond to the queries.

People really want to know where the Season 1 pineapple — which inspired Ted to lay out the evidence on a cork board to crack the mystery — came from. Will we find out? — Josh Radnor (Ted)

Sorry, Josh. Bays says this question can never be answered because Future Ted told the audience that "we never found out where the pineapple came from." To then provide an answer would break the show's rules. "If the narrator said it, it's gospel," says Bays.

I would like Marshall to be visited by the ghost of his father, because Marshall very firmly believes that is possible, as I've also always believed personally. — Jason Segel (Marshall)

You're in luck, Jason! "That is actually happening," Bays says. "In the second half of the season, Marshall will be meeting the ghost of his father, played again by Bill Fagerbakke."

They're building up to introduce Robin's mom soon. She missed her flight to Barney and Robin's wedding, so I'm interested to see if she gets there. And what happened to my sister, Katie, who was played by Lucy Hale (Pretty Little Liars)? — Cobie Smulders (Robin)

"We're trying to get Lucy back," Bays says. "Of course Katie would be at Robin's wedding." As for Robin's mother, Thomas offers, "Something's happening, but we can't say what."

Is this wedding really going to happen? A lot of fans think it won't, which I certainly hope is not the case. — Neil Patrick Harris (Barney)

The groom can rest assured. "The wedding will happen," Thomas says.

Wasn't the goat that Lily rescued in Season 3 supposed to come back? — Alyson Hannigan (Lily)

"That's very interesting," Thomas says. "That's something we haven't thought about revisiting, but now maybe we will in the eight episodes we have left to shoot."

I'm not entirely convinced [actress] Cristin Milioti is the Mother. — Bob Saget (Future Ted)

"That would be terrible to do to me!" says Milioti. But she can stop sweating about this. "If Ted said it," says Thomas, "then yes, she is most certainly the mother of those children."

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