A few days ago gave us a bevy of sneak peeks at 'How I Met Your Mother's ninth and final season premiere "The Locket / Coming Back," though it seems they've saved the best for last in advance of Monday's debut. The latest look at season 9 sees Barney revealing his unsurprising 'Game of Thrones' favorite, as he and Robin plot a dastardly murder that could shake the entire series to its core. Or not.

Via Entertainment Weekly, the final sneak peek of Monday's 'How I Met Your Mother' premiere picks up where one of the previous clips left off, dealing with the bombshell revelation that Barney and Robin might actually have a relative in common. Naturally, incest talk can only lead to one of two HBO dramas currently airing, and we'll thank Barney for choosing the blonder of the two as he and Robin plot out the least murderous way to deal with their coming nuptials.

Meanwhile, the final season of ‘How I Met Your Mother’ has recruited such guest stars as returning ‘Karate Kid’ star William Zabka, ‘True Blood‘ star Anna Camp (replacing ‘The Office”s Ellie Kemper), Sherri Shepherd, ‘Revenge‘ star Roger Bart, and Wayne Brady and John Lithgow reprising their roles as Barney’s half-brother James and biological father Jerry. In addition to clarifying the final season’s wedding weekend format and releasing new promos, clips and photos, CBS previously revealed that all four regulars would meet the mother prior to Ted.

The final season will be upon us this Monday, so check out the latest 'HIMYM' sneak peek up top and give us your season 9 wishlist in the comments!