Bastion was "born" when the giant robotic Sentinel, Master Mold, having absorbed the advanced Sentinel prototype Nimrod into its systems, fought the X-Men who saw no other way to stop the virtually indestructible amalgam except to force it through the Siege Perilous, a pan-dimensional portal which subjects those who pass through to the judgment of the universe's higher powers.

Re-emerging from the portal as an amnesiac human/Sentinel hybrid with a seemingly immortal essence, he was taken in by a woman named Rose Gilberti. Living with Rose, she adopted him as a surrogate son and gave him the name Sebastion Gilberti. He began to hear about America's mutant problem. At some point, Bastion fell in with anti-mutant groups, like Graydon Creed's Friends of Humanity.

Cybernetic Body: As a cybernetic life form he possesses all of the various superhuman attributes:

Superhuman Strength:His cybernetic body makes him superhumanly strong well beyond the human limit.

Superhuman Speed: As a cybernetic life form he can run and move at speeds that are beyond the physical limits of the finest human athlete.

Superhuman Durability: As a cybernetic life form his construction makes him very durable.

Superhuman Stamina: As a cybernetic life form he can exert itself well beyond the human limit.

Superhuman Agility: As a cybernetic life form his agility, balance, and bodily coordination are enhanced to levels that are beyond the natural physical limits of the finest human athlete.

Quick Repair: The nanites in his body provides him a self-repair similar to a Healing Factor.

Flight: flight via jet boots

Technopathy: He can command and control computer systems and Sentinels

Energy Projection: laser vision and can shoot laser beam from his hands

Psychic Immunity: It is also immune to psychic reading from telepaths.