ArchivistP

Pennywise The Hulk doesn't have a way to actually kill Pennywise, and if Pennywise is on his game and can actually overwhelm Hulk's rage with terror or remorse, he might actually edge him out.

Doomsday Doomsday would clean Hulk's clock. Hulk might look good in the beginning, but the damage he inflicted on Doomsday would ultimately only make Doomsday more resilient. Eventually, Hulk would be worn down and eviscerated.

Predator (Alien) The main advantage the T-900 has in the movies is that its technology vastly outpaces its targets. Against a fully armed Predator with a plasma caster, the T-900 simply wouldn't have the mobility to handle an attack.