Like some I disliked the crossover, it's the worst out of all of them, and this is my preference for it to be done. Here are the ideas God blessed me with: PART ONE: The Supergirl part is the least changed out of this whole thing. We establish why the Monitor can't fight the Anti-Monitor. The Monitor himself is trapped within dimensions. He can only pass through the dimensional barriers for short period at a time, or he will start to deteriorate. When the Anti-Monitor first began, his thirst for the destruction of this multiverse was too great, and the Monitor realized that he and him were tied by cosmic energy and that they both had to be trapped at the same time. He trapped them into the vanishing point. The nexus of the flow of time. With no time, they'd have no connection to the energy sources of the matter of their respective universes and be unable to act within time directly physically, locking them in using the language of time. The time masters never realized they'd built their base around it. Nash Wells opened the portal from the outside that no man should know how to open encoded with the language of time, punching through the barrier between this universe and the vanishing point, that the Monitor had been using to traverse between it and this universe. The Monitor explains that the only reason he's been able to leave at all, is because of the field being loosened reverberating backwards in time due to a near future release of the Anti-Monitor. No running off to another earth to deal with another Oliver trying to protect Clark and Lois's baby. Any personal scenes between Sara and him would just be between Oliver 1 and and her. The other legends would be unable to come due to them being trapped in the past. The red skies of anti-matter making it so they can't time travel back and the others can't time travel to get them. Like with Barry. We delve into Kate's feelings regarding what's happened with her story and she tells Kara that after she catches Alice she's going to quit being Batwoman, as she can't accept the consequences of people she cares about suffering and dying because of her actions. Barry would comfort Kara about the destruction of Argo. This loss would be like a blow of the loss of her people all over again. Oliver would meet Supergirl's Earth Oliver Queen/Green Arrow, who is played by Colin Donnell. Sara offers the waverider for help in carrying people off of Supergirl's earth. In the final fight of the episode, the shadow creatures would be more of physical force to hold back as people escape. They can defeat them, but not with hand to hand combat from the powerless humans. As the battle is beginning to be lost, Monitor starts transporting the other heroes away, but before he can do it for Mia and Oliver, a shadow creature takes over Lyla and the Anti-Monitor speaks through her, thanking the Monitor for using their cosmic energy to empower Harbinger, binding her to the Monitor and to him, making it so he could siphon his power from him, taking what's rightfully his. Oliver and Mia make a move to stop him but the Anti Monitor throws them back with a telekinetic blast. The Anti-Monitor rips Monitor's energy from him, the Monitor beginning to turn into dust, dying. The AM then turning to Oliver, smirking and then teleporting away. Oliver and Mia get their bearings and both look to see the army of shadow creatures rage toward them and Oliver, thinking quickly, takes out a breach device, activates it and throws it to Mia, her realizing what's happening as it lands in her hands and it transporting her away as she yells out to him. Oliver takes out his bow and arrow and begins fighting off the creatures as best he can, him holding them back for just a moment, as other ships escape Supergirl's earth. With no more arrows he fights them hand to hand, but they quickly overwhelm him, as we see a wideshot of the shadow creatures destroying the tower and it falling. Meanwhile Mia is transported to the bunker on E1 and is met with Barry asking where Oliver is, as she furiously tries to reactivate the breach device, but it no longer works, her breaking down into tears. Barry realizes what's happened and in a moment of emotional desperation, punches a whole through space time, causing a breach (like Zoom did in season 2 of The Flash), racing through and reappearing with Oliver. Oliver's badly wounded, in horrible shape, near death, but not dying. He's still alive. And Kara watches on devastated at the destruction of her earth. The weight of this, of watching helplessly as another planet of hers, another home of hers, is destroyed, crushing her. END OF PART ONE.