Ghostbusters: Displaced Aggression — IDW Publishing
Issue: #2 C
Peter and Rachel (the newest Ghostbuster) arrive in the days of King Arthur, only to learn his trusted advisor Merlin has been replaced by... a bearded, sword-wielding Dr. Ray Stantz! All that and the ghost of Morgan LeFey, too!
First appearances: Rachel Unglighter
Creators: Scott Lobdell, Neil Uyetake, Nick Runge, Armando Durruthy, Chris Ryall, Tom Waltz, Ilias Kyriazis
Characters: King Arthur, Morgan le Fay, Rachel Unglighter, Ray Stantz, Peter Venkman