Suggestions by @whatsthatthing

Sydney Lemmon

as Black Widow in Recasting the MCU but only actors whose first name begins with an S

Sophia Bush

as Maria Hill in Recasting the MCU but only actors whose first name begins with an S

Suki Waterhouse

as Peggy Carter in Recasting the MCU but only actors whose first name begins with an S

Sofia Boutella

as Gamora in Recasting the MCU but only actors whose first name begins with an S

Simone Missick

as Maria Hill in Recasting the MCU but only actors whose first name begins with an S

Shalom Brune-Franklin

as Peggy Carter in Recasting the MCU but only actors whose first name begins with an S

Steven Strait

as Doctor Strange in Recasting the MCU but only actors whose first name begins with an S

Sylvester Stallone

as Groot in Recasting the MCU but only actors whose first name begins with an S

Scott Foley

as Iron Man in Recasting the MCU but only actors whose first name begins with an S

Shawn Ashmore

as Ant-Man in Recasting the MCU but only actors whose first name begins with an S

Shawn Ashmore

as Hawkeye in Recasting the MCU but only actors whose first name begins with an S

Sam Worthington

as Hulk in Recasting the MCU but only actors whose first name begins with an S

Seann William Scott

as Ant-Man in Recasting the MCU but only actors whose first name begins with an S

Scott Speedman

as Captain America in Recasting the MCU but only actors whose first name begins with an S

Steven R. McQueen

as Winter Soldier in Recasting the MCU but only actors whose first name begins with an S

Sterling K. Brown

as Black Panther in Recasting the MCU but only actors whose first name begins with an S

Steven Spielberg

as Director in Recasting the MCU but only actors whose first name begins with an S

Sam Heughan

as Vision in Recasting the MCU but only actors whose first name begins with an S

Simon Pegg

as Phil Coulson in Recasting the MCU but only actors whose first name begins with an S

Stephanie Corneliussen

as Black Widow in Recasting the MCU but only actors whose first name begins with an S