Cold Rush
Sif is still on the trail of the Frost Giant general, and she sends you out into the field to trail Frost Giant groups in the hopes they lead to their commander. Follow the yellow objective markers to reach the street with the Frost Giant aggressors. As with many of your missions before, clear the Frost Giants from the area to continue with the mission. With Hulk, you can Charge in and finish off creatures left and right with your combo attacks.
The second checkpoint is just up the street. Stay with the same strategy: Charge in and upend enemies, then smash victims one by one until they explode. If you need a moment to think, jump up in the air and then down with an Air Attack to deal damage to those around you and momentarily clear the immediate area. When the final Frost Giant falls, you complete Sif’s second Frost Giant general mission.
Take Snow Prisoner
Sif’s final side mission sends you to the Frost Giant general’s fortress. Follow the objective marker to the location and land at the ice blockade out front.
The first group of Frost Giants patrols the ring of ice beyond the entrance. Smash them around with a two-handed hammer swing, or let go of Mjolnir and rip through them from afar. Either way, they won’t stand long against Thor.
More Frost Giants appear inside the second ice ring. Repeat your attack pattern from the first area. If you need some extra defense, retreat to the first ring for more space or take to the skies.
You meet the Frost Giant general in the third ring. Take out the smaller Frost Giants around him first, then turn your full attention to the general. Whenever he claps his hands and releases the icy shock wave, double-jump or hover to avoid the blast. Immediately after the shock wave passes, power up a Mjolnir Lightning Charge and throw your hammer at the general. It will take half a dozen blows or so, but eventually you’ll shatter the general and complete Sif’s final mission.