Cancel your weekend plans, because the fifth and final season premiere of BBC America's Orphan Black is making its long-awaited debut on Saturday June 10, and judging from our exclusive sneak peek it's going to be full of major milestones and a fair amount of 😱 (on that note: spoiler alert, this clip involves a severed head).

In what can only be described as a huge first for the show, check out the moment that clones Alison and Rachel—who could not be more at odds—come face to face under slightly tense, and more than slightly shocking circumstances.

Ready for Saturday yet?

Orphan Black airs Saturday June 10 at 10 p.m. ET.

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