Created by Mary Jo Duffy, Trevor Von Eeden, and Dave Cockrum, the character first appeared in Power Man and Iron Fist #58 (August 1979).

[6] The character made its live-action debut in the Marvel Cinematic Universe television series She-Hulk: Attorney at Law, portrayed by Joseph Castillo-Midyett.

"[10] El Águila debuted in Power Man and Iron Fist #58 (August 1979), created by Mary Jo Duffy, Trevor Von Eeden, and Dave Cockrum.

Upon discovering his mutant powers, Alejandro decided to use his unique abilities as a swashbuckler and costumed crime fighter, taking up the mantle of El Águila (Spanish for "The Eagle"), an identity passed down by his ancestors.

Soon after launching his crime-fighting campaign against drug dealers, slumlords, brutal police, and other wrongdoers, Águila encountered Iron Fist, Power Man, and Misty Knight.

[17] Alongside Colleen Wing and Misty Knight, he battled mercenaries working for Ward Meachum and fought Fera.

[17] He aided Power Man, Iron Fist, Colleen Wing, Bob Diamond, and Rafael Scarfe in an attempt to rescue Misty Knight and D.W. Griffith from captivity by Ward Meachum's mercenaries.

[27] El Águila appears in the She-Hulk: Attorney at Law episode "The Retreat", portrayed by Joseph Castillo-Midyett.