Bio: Master Xar was a scientist of Xandar, a planet in the galaxy Andromeda that was invaded and destroyed by the Skrulls. He invented the inversed ion beam that brought Adora to Earth. He also helped Reed Richard create H.E.R.B.I.E. by using the science of the Living Computers of Xandar.
#204 - 'The Andromeda Attack!' #205 - 'When Worlds Die!' #206 - 'The Death of... The Fantastic Four!' #209 - 'Trapped in the Sargasso of Space!' #214 - '... And Then There Was -- One!' #217 - 'Masquerade!'