'Outlander' Stars Dish on Claire and Jamie: 'Their Marriage Really Gets Tested'

The wait is almost over!

After more than six months off the air (never do that again!), Starz's sexy time-travel saga Outlander finally returns this weekend with eight all-new episodes and it's going to be well worth the wait. Saturday's return episode picks up right where we left off, with Jamie (Sam Heughan) storming the room just as the maniacal Black Jack (Tobias Menzies) is about to do ungodly things to Claire (Caitriona Balfe).

WATCH: 'Outlander' Stars Share Their Best Tips on Getting Through Withdrawal!

Though Jamie rescues his wife from the clutches of Black Jack, their marriage will face even more challenges in the episodes ahead. Tomorrow's return, told solely through Jamie's point of view, offers a glimpse into their opposing views on how a husband and a wife should behave -- and their differences will cause both physical and emotional pain.

"Their marriage really gets tested," Balfe tells ETonline in the video above. "They've sort of been in the honeymoon phase up until now."

One person who comes into the fold again is Laoghaire (Nell Hudson), the young woman with whom Jamie had a fling and still holds a candle for him -- an issue that may have dramatic repercussions for Claire and Jamie.

WATCH: Why Is 'Outlander' Star Caitriona Balfe Still Intimidated by Claire?

"From this point on, a lot of outside events come in and test their union -- and also internal [issues]," Balfe adds. "I really think they have to come to terms with the fact that they are two people from very different times." 

"They have different moral codes. They have different ideas about what should and shouldn't be. They have to learn that even if they can't accept each other's actions that they have to understand where they come from," she continues.

Heughan notes that Jamie and Claire's reunion does not go over well, thanks to their differing views on who is at fault for the bind they will find themselves in. That's not to say viewers will be devoid of Outlander's sexy love scenes -- in fact, far from it.

"There's a lot of challenges that this relationship faces," he says. "Every time there's 'sexy time,' it's moving the relationship forward and it's about another element of the relationship. It can't just be gratuitous and it's always developing."

Even so, don't expect things to be rosy.

"Ultimately, Jamie and Claire really have to right to get back to each other," Heughan says.

Outlander returns Saturday, April 4 at 9 p.m. ET/PT on Starz.

Watch Outlander stars Caitriona Balfe and Sam Heughan reveal their tips to ETonline on how to help get over the wait until the premiere!