A nuclear clear up, a bloody massacre, an extremely fraught game of marbles … From The Bear to Blue Lights, here are television’s most heart-pounding outings A nuclear clear up, a bloody massacre, an extremely fraught game of marbles … From The Bear to Blue Lights, here are television’s most heart-pounding outings T elevision is supposed to be relaxing. Flop on the sofa, lose yourself in your favourite show and feel your shoulders unknot themselves. Yet sometimes the best episodes are the most