The 51-year-old ITV chaser flirted with 43-year-old Sam after she revealed that she had a crush on him.
After securing £7,000 to face the chaser with, Bradley announced: "Time to face the juggernaught."
Mark said: "Good afternoon. Sam you're a HGV driver, well this is one wide load you're going to struggle with!"
With a cheeky wink, Sam gushed: "I hope so, secret crush!" before she brought her hands together in the shape of a heart.
The Chase: Bradley Walsh SHOCKED as Mark Labbett teases a 'struggle with his wide load'
The Chase: Sam speaks with 'crush' Mark Labbett
The Chase: Bradley Walsh shocked as Mark Labbett tells Sam of his 'wide load'
The Chase: Bradley Walsh gobsmacked as Mark Labbett tells Sam of his 'wide load'
Sam you're a HGV driver, well this is one wide load you're going to struggle with!
Bradley, 56, looked on in confusion as Lincoln-based Sam made the revelation.
The shocked host asked: "Really? He certainly would [crush you] if he sat anywhere near you!"
Fans of the show took to social media to laugh at the situation.
One viewer tweeted: "Beast getting flirty with the truck driver. #TheChase."
The Chase: Mark Labbett teases a 'struggle with his wide load'
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"Did Mark actually just say she'd struggle with his wide load? #TheChase," asked another.
A third said: "He's alright the beast," before a fourth noted: "#TheChaseBradley Walsh is hilare #TheChase."
However, the game ended in misery as Sam, who specialises in food deliveries and frozen goods, was beaten by her crush and sent home.
Previously working for the NHS mental health unit for 15 years, the quiz contestant had hoped to visit friends in Texas having worked there as an au pair.