What Lies Beneath (series 25)

 was the fifteenth episode of Series 25 and the 746th episode of Casualty overall.

Plot
Joe comes into the Emergency Department to see his son, Mike, who is recovering after being attacked by Karl and his gang. When Joe meets paramedic Jeff Collier, he insists that Jeff help him take on Karl. Jeff, not realising the extent of Joe's woes, refuses.

But when Karl and his gang terrorise the ED, Jeff and Karl square up and Jeff is shown a video of Joe eating dog faeces. After Ruth announces what has happened in front of an audience, a mortified Joe tries to take his own life, forcing Jeff to go looking for Karl to exact retribution. Catching Karl halfway through dousing Joe's flat with petrol, Jeff agrees that burning down the flat is a good idea and grabs the lighter. Will Jeff break the law as he tries to teach the gang leader a lesson?

Mads is saddened to learn that Mrs Ahmed, a Pakistani woman she's been treating, doesn't actually have any family despite making up stories about them. Mads is torn between her own family values in Pakistan and the values of the team, led by Zoe, who want her to come to the pub.

Lenny has been avoiding his sister Helen after being been told that they aren't a suitable donor match. When Helen asks directly, Lenny is put on the spot. Will he have the heart to tell her the truth and dash her hopes of recovery?