Literally copy pasted Endgame's plot in the first half.
The movie begins with the heroes launching an assault on an alien warlord in his home planet. Their plans fail miserably, leading to major consequences. 5 years later the surviving heroes regroup and make one final attempt to fix things. A massive roster of characters are split into 3 teams, one of which breaks into a genius billionaire's tower.
But it wasn't enough to rip off one marvel movie. In the climax, the main characters unleash a giant red demon to hold off the main villain while they escape before the planet gets blown up. And also King Shark is a shark. Very original.
I enjoyed Flashpoint and Justice League War way more than this. Consequences don't really matter when you know time travel exists. Although the movie had many 'shocking' deaths, it didn't really leave any impact because most of the characters didn't get a single line of dialogue. It was pretty obvious they were going to hit the reset button at some point.