Candidates for the Big Bad:
- Thanos since his Black Order is involved
- Jossed: The Big Bad is revealed to be The Grandmaster, and an unknown Challenger, who chose Earth as a battleground.
- Voyager
- Jossed: The Big Bad is revealed to be The Grandmaster, and an unknown Challenger, who chose Earth as a battleground.
- Hank Pym/Ultron
- Jossed: The Big Bad is revealed to be The Grandmaster, and an unknown Challenger, who chose Earth as a battleground.
- It's also illogical for Ultron to be the Big Bad because he would not keep some Avengers in stasis, as his goal is to Kill All Humans.
- And on top of that, Ultron is busy being the Big Bad of the concurrent cosmic event Infinity Countdown.
- Jossed: The Big Bad is revealed to be The Grandmaster, and an unknown Challenger, who chose Earth as a battleground.
Voyager is another Elder of the Universe:
- They all have that sort of title.
- Confirmed! She's Grandmaster's daughter.