and in a  surprise move cbs has decided to pull the plug on under the dome citing its ratings keep dropping. which means its now running current season will be its last  and of course producers talking about the canceliing say they have plans to make sure the thing ends the way fans deserve which means the dome will proably be gone now by the finale. as in a surprise move though citing low ratings. cbs shows its done  a bit with steven king . by pulling the plug on under the dome. this season last.