Mephista is taking Doc to daddy thru a backdoor dimension, when Satannish appears. Mephisto and Satannish fight, but tricks them yet again before several dimensions are destroyed.
Strange Academy #1
Batman: Three Jokers #2 (of 3) - Batgirl Variant
Batman: Three Jokers #1 (of 3) - Hook Variant (with Playing Card insert)
Strange Academy #2
Monster Pile-Up #1