Anglesey - Clips from the five minute aerial skirmish were posted on the Royal YouBoob! site today as the Queen visited RAF Valley in Wales.
The footage shows RAF search and rescue pilot Prince William singlehandedly shooting down an ominous motherfuckercraft suspected of systematic sheep abuse.
William told the Queen this afternoon that he'd spent hundreds of flight hours scouring the Welsh countryside for 'bastard alien craft'.
The UFO safari was aimed at downing and recovering the flying saucer which he wants to present to HM as a very special Golden Jubilee trophy next year.
Scenes from the Royal YouBoob! video show the pesky mothership exploding over Llanfairpwllgwyngyll (honest!), coating the surrounding countryside in millions of gallons of fluorescent alien goo.
An MoD statement later explained the craft was the top suspect behind the foul targetting of Welsh sheep after getting caught firing low level extraterrestrial blow darts impregnated with alien spermatozoa.
"It was a cynical bid to repopulate large swathes of the Principality with alien-ovine hybrid mutants," Bridagier Harrier Moth-Balls commented.
"Like we need any more of those round here!" outraged Pantypwdyn Road, Abertillery resident Mrs Dorcas Splott retorted after hearing the news.
Prince Harry is Nick Clegg's royal first-spawned.