I know Havok has a limited degree of energy absorption powers, but Cyclops doesn't and he's still immune to Havok's abilities.

  • It might have something to do with the fact that they are brothers and their powers are very similar. It also stands to reason that since they can't hurt them-selves with their own power, it would make sense that they are immune to each-other's power. – onewho Jun 12 '15 at 20:02
  • As I recall Banshee and Black Tom, who are cousins, were also immune to each other's powers. – Boelabaal Jun 12 '15 at 20:14
  • Pietro isn't immune to Scarlets powers. – user16696 Jun 12 '15 at 20:32
  • In the Uncanny X-Men's first battle with Proteus, Cyclops specifically says that he and his brother can "metabolize" each other's blasts. And during Inferno, Havok uses his blasts to supercharge Cyclops'. So it's not just genetics; they actually absorb each other's energy. – Blazemonger Jun 14 '15 at 2:12

Havok has slighty more than

A limited degree of energy absorption

Havok is constantly absorbing cosmic radiation and can absorb or drain specific energy targets.

Cyclops also does this but to a lesser degree, absorbing sunlight to charge his optic beams. He has also absorbed lightning from Storm though this caused him pain. - Uncanny Xmen Annual #3

Neither Cyclops nor Havok are fully immune to the powers of the third Summers brother Vulcan. As Vulcan is an Omega level mutant this could just be a case of his powers being too much for the others to absorb.

Interestingly Vulcan is immune to Cyclops' powers and can even control his optical blasts, - X-Men: Deadly Genesis #4

But Vulcan is not immune to Havok's powers, which would suggest that the energy Havok releases is more powerful than Cyclops' energy.

I would say that the Summers brothers can cancel out each others powers (mostly) due to the fact that they can all emit and absorb energy.

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