- "Uh...you're not authorized to be here."
"Son, just don't."
- ―Steven Tyler and Captain America
Steven Tyler was at one point a mechanic on the S.H.I.E.L.D. Helicarrier, and between the Battle of New York and the attempted rescue of Franklin Hall, he was promoted to the rank of field agent. Agent Steven Tyler was responsible for the transfer of Gravitonium to The Fridge, and the subsequent removal of the identification placard.
Before the Battle of New York
Steven worked for S.H.I.E.L.D. as a mechanic during the events before the Battle of New York. While performing maintenance on a Quinjet after the Attack on the Helicarrier, he was approached by Captain America, Black Widow, and Hawkeye. Steven initially told the trio that they were not authorized to use the Quinjet, to which Captain America replied "Son, just don't".
After the Battle of New York, Steven became a field agent, and after the attempted rescue of Dr. Franklin Hall from Ian Quinn's compound in Malta, Phil Coulson instructed him to take the Gravitonium that Quinn had obtained and to store it in The Fridge. Coulson further instructed Agent Tyler to remove the identification placard from the storage entrance, due to Franklin Hall's concern that the Gravitonium was too dangerous and might fall into the wrong hands
- S.H.I.E.L.D. (First Incarnation) - Allies
- Avengers - Allies