Sonja Flemming/CBS
March 30, 2016 at 10:24 PM EDT

When The Big Bang Theory returns on Thursday, Amy and Sheldon will take the next step in their relationship.

As EW first revealed, Sheldon (Jim Parsons) will open up to Amy (Mayim Bialik) about a weird secret he’s never revealed to anyone. “They explicitly talk about that this is a new level of trust, and that’s really special,” Bialik tells EW, hinting as to what the secret is: “It’s along the interest in Sheldon as a spectrum-y person kind of information, and it’s a really sweet episode.”

While the revelation of a secret doesn’t sound as monumental as the duo finally sleeping together earlier this season, it is a big moment for the couple, whose relationship has moved at a relatively glacial pace since season 3. “The [writers] are doing one thing after another to keep that relationship advancing without shoving it into the future,” Parsons says. “This is one of those things that doesn’t necessarily change anything from a viewers’ perspective on a day-to-day basis of watching the show, but in a subconscious way and from the groundwork of the show in general, it adds a layer of something between them.”

As Sheldon becomes more comfortable in his relationship with Amy, could he actually open himself up to the possibility of allowing newlyweds Leonard (Johnny Galecki) and Penny (Kaley Cuco) to finally move in together? “Yes, I do think so,” Parsons says. “But how do you literally split apart those two guys who live in that apartment that’s so central to that show? I’m just being unimaginative here, I’m sure the writers can do it, but I don’t understand how. How do we get out of that apartment? Maybe Amy moves in.”

RELATED VIDEO: Melissa Benoist’s Supergirl survivor guide

The Big Bang Theory airs Thursdays at 8 p.m. ET on CBS.

You May Like