In grainy footage, a mysterious object with bright blue lights is seen behind some trees.

When the cameraman zooms in, he spots a grey figure strolling through inside it.

From the distance and quality of the video, it is hard to make out who or what the shape is.

But after UFO fanatics Blake and Brett Cousins posted it as part of a live phone-in, their followers were quick to claim it was an Alien Grey – a supposed extraterrestrial being named for its skin colour.

Believer, Brett, likened it to something from famous alien movie Close Encounters, before claiming there is no CGI at play.

BIZARRE: A mysterious grey shape was filmed walking inside a craft (Image: YOUTUBE/GETTY)

“You know how the ship looks like it’s landed behind the tree, it looks like they were stationed there because the one walking by looks like it was wearing an orange space suit,” one viewer then says.

“It didn’t even look like a human at all.

“It possibly might be something with the government but it’s unexplainable.

“In my opinion these things come from another planet.”

Another fan then called up offering a different explanation.

PROOF: Some viewers claimed it was an alien (Image: YOUTUBE)

“I just watched this four times and this Alien Grey, he moves a lot like a human.

“He looks like he’s wearing some sort of leggings or pants and his movements are very similar to a man’s – it looks like he’s working on the controls of the ship.”

Not everyone was as convinced by the footage, however.

“Nothing but light and mirrors,” one commented.

And another agreed, writing: “Looks like someone camping and using fluorescent tube lanterns to light the camp site.”

Meanwhile, a set of crop circles appearing in the English countryside has caused a stir.