By Olivia Wheeler EastEnders aired a huge explosive return on Monday night as Martin Fowler – played by James Bye \- returned to Walford. However, in true soap style, Martin’s return was nothing short of dramatic as he uncovered a huge secret. During the episode, Jack Branning worried about Denise Fox’s ultimatum after she told him it was either his job or their marriage as he continues to question the events of Christmas Day. Later, Jack decided to confide in Stacey Slater, who he has been having an affair with, where she urged him to do whatever Denise wants in order to keep the peace. Stace…