In Tokyo, Ghidorah had finished generating his huge storm over Tokyo

Ni: We must summon an army to defend us and our new "fortress"

San: Yeah! So we can take over this God-awful Planet!

Ichi: yes indeed.

Ghidorah releases an alpha call to summon certain Titans

In Brazil, Megaguirus stops stomping and heads for Tokyo(edited)

Megaguirus: Megaguirus, coming!

Elsewhere a huge bat Titan screeched in the night

Camazotz: Camazotz, hunting!

In The Philippines, Gigan blasts up some livestock with his laser eye hearing the call and heading for Tokyo

Gigan: Gigan, hearing the call!

In Africa, Stingclaw had finished piercing an elephant to death with it's stinger

StingClaw: StingClaw, sting!

In Romania, Xiothul had crushed an unsuspecting villager with his feet

Xiothul: Xiothul, hearing the call of the King!

In Antarctica, Jagus and his battle with a giant penguin gets interrupted by King Ghidorah's call

Jagus: Jagus, hungry!! 

he leaves the large penguin, who is Titanus Aptenodytes

Aptenodytes: Where's he going..?

Several Meganula and small Skullcrawlers also hear the call for their king and head for Tokyo, the teams have no idea of the danger they'll be heading into