A brilliant script by Sarah Phelps follows up on the ratings smash “Hello Princess” cliffhanger from the previous episode with what is basically a two-hander, something that Eastenders was well known for by this point but to use it as a device to bring back the Square’s most iconic character ever, Dirty Den, rather than any big explosive fireworks feels like a masterstroke because it deftly grounds the bizarro idea of someone coming back from the dead in a reality that makes it believable.