The soul of a departed child who so loved the CENTINELS that he returned from the afterlife. Beloved by neighborhood kids for his ability to walk through walls to retrieve lost balls.
- Wonder-Ghost's real name (Jasper Brown, Jr.) is a possible reference to Casper the Friendly Ghost.
- Wonder-Ghost is one of the three undead Wonderful Ones. The others are Wonder-Samurai and Wonder-Zombie.
- Wonder-Ghost is the lightest Wonderful One (due to being a ghost).