Team Housetrapped.

Leader: John Egbert. Led the beta kids to victory, and has windy powers capable of drilling a hole through a planet.

Warrior: Dave Strider. Timetravelling swordsman, capable of using it to effectively create clones.

Scientist: Jade Harley. Space-warping girl, able to turn planets to the size of softballs, and capable of lightspeed travel.

Rogue: Vriska Serket. Pirate, and luck thief, with a weapon based on luck, whose ultimate attack puts her on par with a being with powers near that of Jade.

Tank: Gamzee Makara. In all of the many offshoot timelines in Homestuck, he did not die until certain events which were later retconned. Durability wise, he tanked machine gun fire for likely a straight minute or more, but was later fine.

Big Gun: Rose Lalonde. At least continent-busting, probably planet-busting now magic wands, and capable of a PTV-esque precog, though atmittedly less refined.

Round 1: Rose finds him with Light-Vision. Jade TPs him out while the rest get rid of the hostages with no casualties.

Round 2: Same deal, but with reducing the nuke to the size of a pebble and tossing it into space.

Round 3: Jade shrinks him to the size of a chihuahua, and the rest disintigrate him.

Round 4: I was scared for them until I heard about prep. Homestucks with prep are ridiculous, especially with someone with super-luck, someone with precog, and a time-traveller. Alchemiter is too OP, they create ridiculous gear capable of freezing him in time, Jade shrinks him down, and they all bombard him with red-sun based attacks.

Bonus Round: They probably can't do this one. The best they could do is deter him by shrinking the planets to the size of baseballs, and storing them in their sylladexes. Or just duplicating said mini-planets and then growing them, giving Galactus however much food he wants. But no, they aren't beating him in a fight.