Sif

Silhouette

Silk

Cindy Moon

Silk Fever

Silver Centurion

Silver Fox

Silver Sable

Silver Samurai

Silver Samurai

Age of Apocalypse

Silver Surfer

Silverclaw

Silvermane

Sin

Sinister Six

Sir Ram

Siren

Earth-93060

Sister Grimm

Skaar

Skaar

HAS

Skin

Skreet

Skrulls

Skrulls

Ultimate

Skullbuster

Cylla Markham

Slapstick

Slayback

Sleeper

Sleepwalker

Slipstream

Slyde

Smasher

Vril Rokk

Smiling Tiger

Snowbird

Solo

James Bourne

Songbird

Sons of the Tiger