Supes goes off to beat up some baddies in a different solar system and while he's gone Mercer eats every biological organism on the planet larger than an ant. This includes Lois Lane. Needless to say when supes comes back he's pissed.
Location: biologically ravaged metropolis
Supes is bloodlusted
Mercers feats are increased due to all the biomass he consumed
Can Mercer win this with all the life he's consumed?