Task: Question Generation
Input (English): Context : At GenCon 22 in 1989, Erick Wujcik introduced James Wallis to Kevin Siembieda of Palladium; the result was Wallis' entry into the world of RPG supplement publication through Mutants in Avalon (1990). 
Subject : Mutants in Avalon 
Relation : series
Output (English): What series is Mutants in Avalon part of?