Watch: A 'vanishing act' rocks The Block after Backyard Reveals in shocking sneak peek

WATCH: A "vanishing act" is set to rock The Block next week.

A dramatic sneak peek trailer teases the judges' incredible reactions to the teams' "paradise" backyards, before host Scott Cam explains someone cannot be located.

Stream every episode ever of The Block for free on 9Now.

"We've got a situation," Scotty's voiceover can be heard saying.

"We found her car, microphone, Block phone. We've done everything we can to locate her, and she's not been seen."

It comes after the teams' incredible backyards are revealed to the judging panel, who this week become a team of four when guest judge and gardening guru Dave Franklin joins.

DAN VS DANI EXCLUSIVE: Couple explode over teams' final bedroom and laundries

"You all delivered the best holiday home backyards ever," Scotty tells the teams at the Reveal.

See the judges dramatic reactions in the video above.

WATCH: Kylie and Brad reveal backyard nightmare after 'bombshell' derails entire plans

Take a closer look at the full home listings below ahead of Auction Day.

House 1: Maddy and Charlotte

After Jesse and Paige left The Block, "savvy sister" renovators Maddy and Charlotte have taken over and plan to bring their own unique style to House 1.

This property on renowned Phillip Island offers the perfect blend of elegance, comfort, and convenience.

Bedrooms: 4
Bathrooms: 3
Car spaces: 2
Price guide: $1.7 million to $1.85 million

View the full listing on the Domain website here.

House 2: Courtney and Grant

Courtney and Grant have their own style, dubbed 'Moderterranean'. Their style was certainly praised by the judges, who have given them high scores throughout the competition so far.

READ MORE: Every time Dan and Dani gave their opinions as they walked through the Blockheads' rooms in 2024

Their pride and joy is their home in the western Sydney suburb of Denham Court, which they built and styled. Although not having a lot of renovating experience, they are not complete beginners.

They think their work lives, which include design and landscaping backgrounds, will really help them on The Block when it comes to experience.

Bedrooms: 4
Bathrooms: 3
Car spaces: 2
Price guide: $1.7 million to $1.85 million

View the full listing on the Domain website here.

House 3: Ricky and Haydn

Best mates Haydn and Ricky had a mammoth first week, when Haydn's child was born early – leaving his best pal to continue renovations alone.

But all the hard work paid off, and they created a "modern coastal luxury" space they could be proud of – and we can't wait to see more.

Bedrooms: 5
Bathrooms: 3
Car spaces: 4
Price guide: $1.7 million to $1.85 million

View the full listing on the Domain website here.

House 4: Kylie and Brad

Husband-and-wife Kylie and Brad have a unique style in their home, opting for a dark and mysterious vibe which they've continued throughout their home so far.

The final product is described as a "glamorous family escape".

READ MORE: Everything you need to know about The Block 2024

Bedrooms: 5
Bathrooms: 3
Car spaces: 2
Price guide: $1.7 million to $1.85 million

View the full listing on the Domain website here.

House 5: Kristian and Mimi

Electrician Kristian and restaurant manager Mimi have a unique home on offer in Phillip Island, as it's the only double-storey house this season.

The coastal home has been praised by the judges, bagging them consecutive wins for the guest bathroom and guest bedroom.

Bedrooms: 5
Bathrooms: 3
Car spaces: 2
Price guide: $1.7 million to $1.85 million

View the full listing on the Domain website here.

The Block airs Sunday at 7:00pm and Monday to Wednesday at 7:30pm on Channel 9 and 9Now.

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Stream every episode ever of The Block for free on 9Now.