Chapter 271 The Origin of the Virus

"Well, it seems that the upgrade is very effective! Now, we may have a hard battle at any time! Thinking, send these intelligent lives to the front line immediately!"

Jack reminded Thinking.

Before he finished his words, the next prompt came from the system.

"System Notification: 100% of the ninth doomsday disasters have occurred! Some of the mutated zombies had already reached the level of giant beasts! Please get ready for the battle!"

After receiving this message, Jack rushed into the physique training room without hesitation and continued to challenge the second stage of the test.

On the surface of Mars, a part of the zombies, which was in the urban area, had been active in Steel Star City for some time before they suddenly moved out of the city.

When they were half away, the rocks under their feet suddenly overturned violently.

Before long, a huge eye popped out from the ground.

As soon as this huge eye appeared, it swallowed up tens of thousands of zombies.