The following contains spoilers for Multiversity: Harley Screws up the DCU #4, on sale now from DC Comics.
Aquaman is the latest victim of Harley Quinn's destructive trek through time and space in the DC Multiverse, as Harley has inadvertently led to Aquaman's parents never getting together in the first place.
This all went down in the newest issue of Multiversity: Harley Screws up the DCU, a series by Frank Tieri and Logan Faerber (with letters by Ferran Delgado), that shows Harley Quinn teaming up with her future self to try to stop her past self from, well, screwing up the DC Universe.
How is Harley Quinn screwing up the DC Universe?
In the first issue of the miniseries, Harley Quinn discovers a time machine. She then goes off on a trip through time, but when she returns, all of her friends have been possessed by Starro the Conqueror. A mysterious stranger rescues Harley from her own friends, and after they get to a safe hiding spot, the stranger explains that what happened was that Starro was able to conquer the Earth finally because the people who normally stop him, namely the Justice League of America, no longer existed!
At that point, the stranger reveals herself to be Harley herself, from the altered reality where the Justice League never existed. She then teams up with her other self to try to go back through time to, in Quantum Leap terms, put right what Harley herself put wrong.
How did Harley Quinn erase Aquaman from history?
In the latest issue of the series, the Harleys figure out why Aquaman no longer exists in the DC Universe. As it turns out, during one of her trips through time, Harley met Tom Curry, and after he helped her out, she was so grateful that she hooked up with him. As a result, though, Curry was never able to meet Aquaman's mother, a member of Atlantean royalty, and fall in love and have little baby Arthur Curry.
Luckily, the two Harleys were able to go back in time and stop the third Harley (the one still in the midst of her trip through time) from stepping on baby Wonder Woman when she was still a hunk of clay, so it is possible that they will be able to fix the timeline, but Starro knows what their plan is, so he has sent a Squad of possessed supervillains through time to stop them!
Multiversity: Harley Screws up the DCU #4 is on sale now.
Source: DC Comics