The 5th housemate is a recurring character in the Young ones who appears in the first five episodes He is only ever a background character and never plays a major role nor does he even speak. His name is never revealed either nor do any characterss aknowledge him. Just exactly what his role is within the series is unknown
The character only appears in the first five episodes as a background character. His true identity is never revealed but he always appears in the same clothes with his hair covering his face.
Nothing has ever been revealed about who he is and as a result there have been several wild theories put forward at to who or even what he really is.