Casualty spoilers follow.
Next week's Casualty episode (August 8) sees David Hide's story revisited as he reflects on his past and worries about his future, while Fenisha and Lev battle with their secrets and Dylan is forced to keep his own.
Here are the seven biggest moments to look out for:
1. David reflects on his past
David will take centre stage in next week's episode, as his bipolar disorder is brought to the forefront again.
As David heads out on his routine morning run, he begins to reflect on his past in the psychiatric ward during a period of psychosis.
Viewers will remember that David was sectioned after a psychotic episode that unintentionally put Robyn and her baby daughter Charlotte in danger, and he will be haunted by memories of that time in next Saturday's powerful scenes.
2. David rejects Rosa's support
Rosa's return in last night's episode has thrown David out of the strict routine he adheres to, and we'll begin to see that he actually has some niggling doubts about whether he can make their marriage work after all.
Worried that Rosa wouldn't want to be his wife if she knew the extent of his mental health struggle, David avoids her questions about his lithium check-up and keeps his medication secretively locked away in a drawer.
As his day continues to spiral, David later tells Robyn that he can't open up to Rosa as she doesn't know anything about him.
3. Dylan is forced to keep a huge secret
Having discovered Lev's betrayal in last night's episode, Dylan's fury builds as Luka prepares for his first day of Proton Beam Therapy.
Acknowledging that Faith doesn't need any further heartbreak at the moment, a tormented Dylan decides against telling her the painful truth for the time being. But how long will he be able to keep it to himself for?
4. David struggles to cope
When a patient reminds him of the stigma he faces daily, David finds himself becoming too embroiled in the case and begins to struggle with his anxiety.
With David clearly suffering mentally, he runs to the bathroom and tries to prevent himself from having a panic attack. David also logs the day as high stress in his diary and this stress is exacerbated when he makes a worrying discovery...
5. Dylan confronts Lev
When Lev's secret lover Xander arrives in ED with his friend Claudie (played by former Hollyoaks star Amanda Clapham), who's carrying his baby, the pieces of the jigsaw begin to slot into place for Dylan.
Although Dylan doesn't immediately recognise Xander as the man from Lev's tryst, a later discovery alerts him – and he is unable to stay quiet any longer.
Furious, Dylan tracks down Lev and explains that he saw him in the ambulance station with Xander. Will Lev be able to persuade Dylan not to tell Faith?
6. Rosa makes a promise
Following a heart-to-heart with a supportive Robyn, David makes a huge decision and decides to give Rosa a chance to understand more about his bipolar disorder.
Finally opening up, David allows Rosa to listen to the white noise he listens to when he is running and even gives her the key to his medication drawer.
Rosa is thrilled to be let in to David's private life, and to his relief, promises him that she isn't going anywhere.
7. Fenisha and Ethan grow closer
Having seen Ethan in a new light recently, Fenisha is left further moved when he confides in her over his PTSD next week.
With her feelings intensifying, Fenisha reminds him of his bravery at Holby Comic Con and urges him not to let his past trauma hold him back forever.
Inspired by Fenisha's faith in him, Ethan makes a big decision about his career and also agrees to join Fenisha on a night out. However, when he invites Noel and Robyn along too, Fenisha realises she's stuck in the friend zone.
Casualty airs these scenes on Saturday, August 8 at 8.40pm on BBC One.
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