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"Supernatural showrunner Sera Gamble has dropped hints about new villains the Leviathans. In the CW drama&amp;#039;s seventh season premiere, the creatures took control of Castiel (Misha Collins). &amp;quot;We&amp;#039;ll develop what the Leviathans mean this season,&amp;quot; Gamble told AOL TV. &amp;quot;Like the other bad guys who emerge a little as time goes on, their personalities will become clear in the next few episodes.&amp;quot; The executive producer added that the unseen monsters - also known as &amp;#039;the Old Ones&amp;#039; - are &amp;quot;having fun&amp;quot; and are &amp;quot;here to have a good time&amp;quot;. &amp;quot;They&amp;#039;re not... here to hail fire and brimstone on the world and just be moustache-twirling evil,&amp;quot; she said. &amp;quot;[That&amp;#039;s] something... that we wanted to definitely weave in with these characters.&amp;quot; Gamble also suggested that Castiel may not be dead, despite the Leviathans&amp;#039; claims. &amp;quot;You should never take anyone for their word that anyone is dead, especially when they&amp;#039;re trying to get you out of their way,&amp;quot; she hinted. &amp;quot;You certainly should not just ring the final bell on seeing Cas or Misha just because you don&amp;#039;t know what episode he&amp;#039;ll show up in next.&amp;quot; Supernatural continues on Fridays at 9/8c on The CW. &amp;gt; Supernatural exec: &amp;#039;Sam might lose his marbles&amp;#039; Watch a clip from the Supernatural premiere below:      "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/tv/supernatural/news/a342364/supernatural-exec-teases-leviathan-arc/>