It's as if a hole has been burned through reality itself! 
Batman/Superman (Volume 2) #16 is an issue of the series Batman/Superman (Volume 2) with a cover date of May, 2021. It was published on March 23, 2021.
Synopsis for Superman in "The World of Tomorrow!"
In a world where Bruce Wayne never became Batman, Wayne Enterprises has revolutionized the world under the leadership of his mother Dr Martha Wayne. At Martha's latest press conference, Superman foils an attack by Lex Luthor, who insists Wayne's technical miracles are stolen from him. Lois Lane accepts a dinner invitation from Bruce and brings her colleagues Clark Kent and Jimmy Olsen along. Lois investigates Wayne Manor and discovers a cavern beneath. She is confronted by a Venom-powered Alfred Pennyworth and falls through a rift in reality into another world.
Appearing in Superman in "The World of Tomorrow!"
Featured Characters:
- Superman/Clark Kent (The World of Tomorrow) (First appearance) (Flashback and main story) (Origin)
Supporting Characters:
- Jimmy Olsen (The World of Tomorrow) (First appearance)
- Lois Lane (The World of Tomorrow) (First appearance)
Antagonists:
- Alfred Pennyworth (The World of Tomorrow) (First appearance)
- The Unknown Wizard/Lex Luthor (The World of Tomorrow) (First appearance)
- The Unknown Wizards' Robots (First appearance) (Destroyed)
Other Characters:
- Bruce Wayne (The World of Tomorrow) (First appearance)
- Jonathan Kent (The World of Tomorrow) (First appearance; unnamed) (Flashback only) (Cameo)
- Martha Kent (The World of Tomorrow) (First appearance; unnamed) (Flashback only) (Cameo)
- Martha Wayne (The World of Tomorrow) (First appearance)
- Thomas Wayne (The World of Tomorrow) (First appearance) (Appears only as a corpse) (On a TV or computer screen)
- Perry White (The World of Tomorrow) (Mentioned only)
Locations:
- The World of Tomorrow (First appearance)
- Earth
- Gotham City
- Park Row (On a TV or computer screen)
- Wayne Manor
- Wayne Enterprises (On a TV or computer screen)
- Metropolis
- Smallville (Flashback only)
- Gotham City
- Krypton (Flashback only) (Destroyed)
- Earth
Items:
- Jimmy Olsen's Camera-Drone
- Omni-Battery
- Venom
Vehicles:
- Kryptonian Rocket (Flashback only)
Synopsis for Batman and Robin in "The World of the Knight!"
In a world without Superman, Batman and Robin prevent the Spider Lady breaking inmates out of Arkham Asylum, where they are being subjected to strange experiments. She warns them of a secret society responsible for the world's ills, and their investigation leads them from the warden's office to the Arctic fortress of Dr Atom. However, just as they enter the fortress they are shocked when a version of the Spider Lady from an alternate universe appears in front of them.
Appearing in Batman and Robin in "The World of the Knight!"
Featured Characters:
- Batman/Bruce Wayne (The World of the Knight) (First appearance) (Flashback and main story) (Origin)
- Robin/Dick Grayson (The World of the Knight) (First appearance)
Supporting Characters:
- Alfred Pennyworth (The World of the Knight) (First appearance)
Antagonists:
- Dr. Atom (First appearance; unnamed)
- Dr. Atom's Army (First appearance)
- The Joker (The World of the Knight) (First appearance)
- The Joker (The World of Tomorrow) (First appearance) (Cameo)
- Jones (The World of the Knight) (First appearance)
- Jones (The World of Tomorrow) (First appearance) (First appearance) (Cameo)
- The Penguin (The World of the Knight) (First appearance)
- The Penguin (The World of Tomorrow) (First appearance) (First appearance) (Cameo)
- Spider Lady (The World of the Knight) (First appearance)
- Warden Luthor (The World of the Knight) (First appearance)
Other Characters:
- GCPD (The World of the Knight) (First appearance)
- Kal-El (The World of the Knight) (First appearance) (Flashback and main story) (Also as a corpse)
- Lois Lane (The World of Tomorrow) (Cameo)
- Martha Wayne (The World of the Knight) (First appearance) (Dies in flashback)
- Thomas Wayne (The World of the Knight) (First appearance) (Dies in flashback)
- Jonathan Kent (The World of the Knight) (Mentioned only)
- Martha Kent (The World of the Knight) (Mentioned only)
Locations:
- The World of the Knight (First appearance)
- Arctic Circle
- Dr. Atom's Fortress
- United States of America
- Gotham City (Flashback and main story)
- Arkham Asylum
- Batcave
- Park Row (Flashback only)
- Wayne Manor (Mentioned only)
- Smallville (Flashback only)
- Metropolis (Mentioned only)
- Daily Planet (Mentioned only)
- Gotham City (Flashback and main story)
- Arctic Circle
Items:
- Batcomputer
- Batsuit
- Green Kryptonite (Flashback only)
- Kryptonite Amulet
- Spider Bracelet
Vehicles:
- Batmobile
- Batwing
- Kryptonian Rocket (Flashback and main story)
Synopsis for "Batman and Superman"
On Earth-0, Batman and Superman head to the thermosphere to check on a WayneTech satellite. Superman questions Batman why Wayne Enterprises couldn't check on the malfunction, with Batman informing that the satellite isn't malfunctioning, but infested. Superman finds he is right after seeing the satellite, and checks the material wrapped around it. He finds it is photographic film, but is transient. A group with heads shaped like film cameras suddenly appears, and sentences them to die for touching the "Archive of Worlds".
Appearing in "Batman and Superman"
Featured Characters:
Antagonists:
- The Archivists (Earth 0) (First appearance; unnamed)
Other Characters:
- Wayne Enterprises (Mentioned only)
Locations:
- Archive of Worlds (First appearance)
- Earth 0
- Earth (Cameo)
- WayneTech Satellite
Items:
Notes
- The first two stories happen simultaneously as they come together towards the end.
- The two worlds excluding Earth-0 seen in this issue, are inspired by the Superman and Batman and Robin movie serials of the 1940s, as well as the Golden Age comic books.
See Also