Annihilus is no weakling either. He's solid trans level with the cosmic rod. He also has his own imperial guard full of strong superhumans, the queens and the opposing force using heralds like ravenous. The swarms were endless.
All this is just the wave at the beggining, not counting the quantum bands acquired later, the heralds and high metas enslaved by the insects like terrax, the circumstancial alliances with proemial gods and thanos, and the teleportation tech he gave them.