For weeks now, Justin hasn't felt like himself. He's forgetful, disorientated and careless.
And this week in Home And Away, he finds out why when he's rushed to the emergency room.
The terrifying scenes play out at the garage, where mechanic Justin (James Stewart) is restoring a car using toxic acid.
Despite feeling woozy, he soldiers on – until he collapses in a heap! As he falls, Justin knocks over the bottle of acid, allowing it to pool around him.
"Initially, Justin didn't think there was anything wrong. He was just tired and run down," James, 44, tells TV WEEK.
"He's been working on a car with a lot of rust and he has to use a special liquid that's hazardous – if you inhale it or get it on you, it can burn the skin.
"Justin is pouring some out of a big jerry can when he has a spasm and collapses. Needless to say, things aren't looking very good for him."
Thankfully, Alf (Ray Meagher) is passing by and comes across Justin on the concrete floor, suffering burns from the chemicals.
He quickly calls an ambulance, before letting Leah (Ada Nicodemou) and Tori (Penny McNamee) know of the situation.
At the hospital, Tori treats his burns and runs tests to get some answers.
"Justin's life is in danger at this moment because of the mystery," James says. "We don't know what caused him to collapse and how quickly his health is deteriorating."
What was thought to be a reaction to the chemicals turns out to be far worse.
What does Tori discover?
Amber's bombshell news has rocked Dean to the core. Not only is he a father, but his son is in Summer Bay!
In recent episodes, Amber (Maddy Jevic) finally revealed why she's arrived in town. Her fling with Dean (Patrick O'Connor) years ago resulted in an unexpected pregnancy and the pair are parents to a boy named Jai (River Jarvis).
Now, Dean has to face his responsibilities as a dad – and tell Ziggy (Sophie Dillman).
"Amber never intended to tell Dean he's Jai's father, but ultimately, it was the right decision," Maddy tells TV WEEK. "She's got a past with Dean and will always have a soft spot for him."
Dean agrees to meet his son and nervously waits by the beach for his arrival. When Jai comes running in, Dean is immediately besotted with the youngster and the pair play with ease.
Yet his progress is cut short when Amber introduces him to Jai as a friend, hiding the truth.
As Ziggy looks on in surprise, she wonders whether Amber can be trusted, and where she fits in...