When they accidentally unfreeze a war party, two cavemen brothers must go with them to the lair of a savage yeti tribe to rescue and awaken the only goddess who can end the ice age.

>>>When they accidentally unfreeze a war party, two cavemen brothers must go..

Why must they go?? What step in the cause-and-effect logic am I not seeing here?

>>>to rescue and awaken the only goddess

How can a goddess who needs to be rescued be potent enough to turn back the ice age?? If she can't rescue herself, how can it be that she has the power to rescue everyone else?

>>>When they accidentally unfreeze a war party, two cavemen brothers must go..

Why must they go?? What step in the cause-and-effect logic am I not seeing here?

>>>to rescue and awaken the only goddess

How can a goddess who needs to be rescued be potent enough to turn back the ice age?? If she can't rescue herself, how can it be that she has the power to rescue everyone else?

One more thing, I would change either the brothers or the war party to female characters (Specifically spelled out in the logline)
Otherwise, you will end up with an all-male cast and that can be boring (As can an all-female cast)