Run Dispatch's Z-Team from Batman: Arkham Knight's Gotham, and once the story's over, hand the city to the Joker.
Needs: Batman: Arkham Knight (the game you play) and Dispatch (its heroes' voices and the SDN's sounds play from your own copy). Single player.
The Dispatch board
Open the map: Arkham Knight's own side missions and Riddler trophies near you become Dispatch-style calls, with the hero roster on top.
D-pad up/down picks a call, X chooses it, D-pad up/down picks Invisigal, Flambae, Sonar, Punch Up, Golem, Malevola, Prism, Coupé, Waterboy, Robin or Nightwing, and X sends them. Their stats are weighed against the job, the Dispatch way.
A finished job is finished: the side-mission part or Riddler trophy counts as done in Arkham Knight's own progress, leaves the board and the map, and Batman gets the XP for his level-ups and upgrade points.
Heroes level up to 50, get hurt and healed (Waterboy, Malevola), comment in their own Dispatch voices, and the Cryptographic Sequencer becomes Dispatch hacking. Timed story choices change the team.
D-pad left/right switches between the calls, the health chart, the level-up chart and the Joker page. Dispatch's computer sounds are only heard on the map.
Deathstroke fights you on foot: his Most Wanted tank battle becomes a one-on-one duel in the style of Arkham Origins. Block, wait for his guard to open, strike. Beating him finishes his mission.
After the story
Catwoman and Red Hood join the board and team up with Batman: when you drop someone, one of them takes out the enemy next to them.
Then, become the Joker (locked until the main story is done)
Batman wears Arkham Knight's own Joker and keeps every move, with a long purple coat-cape in his own pinstripe fabric, so you can still glide.
The Batmobile becomes the game's own Jokermobile.
Every takedown is final. Batman's tech goes Joker: the batclaw becomes the Joker's gun from the fear-toxin dream, and the Disruptor's second shot on an armed thug or a medic sets his gear off.
A split Z-Team: Coupé, Invisigal and Flambae work for you. Sonar, Punch Up, Golem, Malevola, Prism, Waterboy, Robin and Nightwing race to save your victims and haul them to prison.
Break Harley Quinn and her gang out of Panessa Studios: Harley adds team takedowns, and her thugs become Joker goons who take jobs and fight the cops.
Finish the jobs and Nightwing comes for you one on one, then Robin in a staff duel like Deathstroke's in Arkham Origins. Then Red Hood hunts you Arkham Knight style, armed and in his cracked-helmet armor: stay out of sight and take him down three times.
Their gadgets are yours: Nightwing's escrima sticks, Robin's staff and Red Hood's pistols each give the Joker a new trick.
The Joker's hits: Barbara Gordon, Alfred, Lucius Fox and Jim Gordon, each out in Gotham under GCPD guard and marked on your map.
Then choose war on the GCPD.
Unofficial fan mashup. Arkham Knight's and Dispatch's content comes from your own copies. Duels inspired by Deathstroke's fight in Batman: Arkham Origins (not needed to play). Uses BmSDK by Team BmSDK (MIT).