There are a lot of speculations about how Mr. Bean is an Alien (from outer-space).
I haven't been able to turn up anything definitive, except for this:
However, later episodes showed Mr. Bean dropping from the night sky in a deserted London street against the backdrop of St Paul's Cathedral. At the end of episodes three and six he is also shown being sucked right back up into the sky in the respective background scenes (black scene in episode 3 and street scene in episode 6). Atkinson has acknowledged that Bean "has a slightly alien aspect to him".
-http://en.wikipedia.org/wiki/Mr._Bean#Characters_and_recurring_props. [emphasis mine]
I would like to find a definitive answer to this, Is Mr. Bean Alien?