Description
Hypothetical idea.. if there are multiverses with multiple variations and different concurrent timelines where every choice the heroes or characters that are not "constant"... affect the timeline.
Then this means there are many universes where evil won. (like the SAINW universe, or the IDW TMNT dark future where all turtles died except Donatello who gave up).. Or worse.. where the heroes made a bad choice and were decimated or lost a member in the fight. There were so many times the turtles were so close.. from being double mutated, roasted, controlled, infected, killed. maimed. asfixiated..etc.. From traps, to environmental events, to surprise attacks and all kind of other phenomena or evil actions. Even a simple choice would have caused huge repercussions (like April not getting rescued in TMNT2012).
In this idea.. Dracula won.. he managed to infect all the turtles.. making them their top tier enforces along with April.
Dracula along with his enforcers defeat all the other heroes and monsters (including The Timemasters and Savanti Romero).
The world is lost..
Other dark ideas..
World where Donatello and Mona Lisa failed, Dregg ended literally eating the turtles and the allies, laying waste to the universe.. including committing genocide against humans, salamandrians and wiping the remaining aeon, kraang and triceratons forces.
World where the turtles failed.. and all became brainwashed by Shredder's mindworms or infected by the brainwashing of Kitsune (IDW TMNT).
World where the turtles fall against Bishop.. and they become experiments.
and many more..