The Heroes vs. Mecha Sonic 1 battle is the seventh battle in the series, between Fire Mario, Shell Luigi, Sonic, Shadow, Yoshi and the opposing Mecha Sonic, fighting over the four Chaos Emeralds and later saving the island. It takes place during Episode 6. The battle ends with Invincible Mario and Super(Star)Sonic stealing the 4 Chaos Emeralds and everybody escaping the island.