The Marvel vs. Capcom series provided a twist on Charlie's fate. In his ending for X-Men vs. Street Fighter, Charlie is captured by M. Bison, who performs terrible experiments on him. Charlie's fate would be left up in the air until Marvel Super Heroes vs. Street Fighter, where a secret character by the name of Shadow appeared.
Shadow is a palette swap of Charlie, with nearly his entire body blacked out, and a white eye shining behind his glasses. His moveset is mostly unchanged, but his attacks would set his opponent alight with blue Psycho Power flames. His Hyper Combos also had a brief pause where his eye would gleam before the move was pulled off; this made him somewhat unpopular, as the gleam could give an opponent enough time to block or avoid the attack.
Other appearances Edit
Street Fighter - Round One: Fight!Edit
In the UDON comic Street Fighter - Round One: Fight!, Charlie has been captured by Shadaloo and brainwashed into Agent Shadow, whom M. Bison sends to observe Vega's investigation, and then eliminate Guile and Chun-Li. Bison's plan backfires, however, when Charlie eventually breaks free of the brainwashing and instead sacrifices himself to protect Guile and Chun-Li by collapsing a cliff upon which both he and Bison are standing.