Watch: The teams react as one Blockhead leaves site and it's not known if they'll return

Watch the video above to see what's coming on tonight's episode of The Block, which will explore the aftermath of what happened after one Blockhead disappeared from site.

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

During Monday's episode, Kylie sent a video message to production saying she was leaving and might not return after her husband Brad admitted to acting "inappropriately" towards Mimi the Saturday prior.

Tonight, the rest of the teams will hear the news.

"There's always reason to leave... I never thought she'd actually leave," Mimi is seen telling cameras in the video above.

EPISODE 45 RECAP: Kylie flees The Block after Brad admits to flirting with Mimi - and no one knows if she'll return

The teams are currently working hard to finish their entire house, and in the trailer we also see Ricky and Haydn hitting a major problem they never could have anticipated.

DAN VS DANI EXCLUSIVE: Couple blast major 'eyesore' in team's backyard and pool area

"We've basically screwed the whole yard..." Haydn says, heartbroken.

The Block continues tonight at 7:30pm on Channel 9 and 9Now.

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