The Gray Ghost is a character voiced by Adam West from Batman: The Animated Series. Within this animated series, the Gray Ghost is a fictional hero who appears in a television show and in movies. The Gray Ghost is played by actor Simon Trent. When Bruce Wayne was younger, he would often watch The Gray Ghost on television, thus the character partly inspires Bruce to become a costumed vigilante, becoming Batman.
Simon Trent appears in the series in one episode as a washed up actor who redeems his fame by helping Batman solve a case that is identical to an episode of his show.
The Gray Ghost made a return appearance in an early issue of Batman: Gotham Adventures in the late 1990s, and turned up again years later in the most recent Batman Adventures series in 2004, in a story about the making of a Gray Ghost film. This crept into in an episode of Justice League Unlimited, entitled "Epilogue", where a Gray Ghost film was the intended setting of Terry McGuiness's parent's murder at the hands of the Phantasm from Batman: Mask of the Phantasm.