(you are Sonic. Sorry, English is not my native language. Everyone lost their superpowers.)

After the disaster.

Having come across an old closed laboratory, they decided to investigate it. This laboratory used to be operational, but later zombies broke inside.

Infinite began searching the upper floors. Silver stayed by the exit, making sure no zombies were nearby. Eggman and Shadow went to the lower underground floors to investigate.

Shadow stepped forward, scanning the corpses around him and shining his flashlight forward. Eggman walked behind him.

Shadow: "I hope we find something useful here."

Eggman: "Don't get your hopes up too much."

Shadow stopped when he heard a strange metallic sound nearby.