Sonic Archives Volume 20 collects issues #75-78.
The bestselling Sonic Archives continues! Mysteries abound in this lead-up to Sonic's third major milestone! Strange things are happening to our True Blue hero. A beam from space threatens the time-stream! The Robians vanish from Knothole! Dr. Robotnik's life story is broadcast across the world! It's up to Sonic and his Freedom Fighter friends to stop each plot and brave the unknowns of space! This volume features the dramatic return of Sonic's worst enemy!