These high domed aliens appeared in the episode "Wargames" (half of the TV movie "Alien Attack") and they laid waste to Alpha in order to teach them a lesson about trust. The Mego figure is a great likeness, there are two variations on the costume, one has a turtle neck look to it. the body is a typical Star trek body (which Palitoy also used to produce their highly sought after Zorro figure).
Palitoy Mysterious Alien on his card. Card photo courtesy of Will (Surfsup)
Anthony Valentine has appeared in numerous TV and movie projects including the "Monster Club" with 1999 cast member Prentis Hancock.