In a SPINOFF ONLINE-exclusive clip from this weeks' episode of Merlin, Morgana (played by Katie McGrath) explains to the captured young wizard (Colin Morgan) how she'll force him to kill his friend King Arthur.

In "A Servant of Two Masters," Morgana tortures Merlin before placing him under her control using the deadly power of a multi-headed serpent known as a Fomorroh. With Arthur's most trusted servant now at her command, Morgana sends him on a mission: to murder the king. Alas, the bumbling Merlin may not be the most adept assassin.

“The darker we go, the funnier we go, too,” co-creator Johnny Capps explains. “That’s always been an important focus for us. No matter how dark the series gets, you never lose the emotional heart of it.”

Watch the exclusive scene from this week's episode below. Merlin airs Friday at 10 p.m. ET/PT on Syfy.