Dr. Eggman just appears in an alternate Earth, full of wreakage. Pieces to tanks, jets, and helicopters are everywhere.
"Ho ho! It seems I'm right on track!" Dr. Eggman exclaimed, "Better put up the white flag!"
A white flag comes out of the doctor's time machine, and he sets off in the direction where his "allies" seem to be.

"Who's that?" Commander Oleg asked. He had seen a strange-looking machine carrying a fat man on camera.
"I don't know, commander," said the Soviet commando, Natasha, next to him, "He seems to come in peace."
Well, if its a trick, he'll be leaving in pieces! Oleg thought to himself, "Let him in, but stay close to him. Something's not right about him."
"Yes, commander," Natasha replied, and walked away.
Moments later, a fat man with a very big moustache walked in.
"Greetings!" said the man, "I am Dr. Eggman, genius."
"A pleasure to meet you. I am Commander Oleg, of the Soviet Union." Oleg replied, and shook the doctor's hand.
"I understand you are a very powerful faction, commander. That's why I'm here! I want to bring one of your commanders, and his units, to my location, so he can help me conquer my world," Dr. Eggman got right to the point.
"Hmm... Your world?" Oleg asked, puzzled.
"Yes. I come from an alternate timeline, where there is no Allied Nations," Dr. Eggman said proudly.
Oleg was instantly interested. "No better commander than myself, comrade!"
"Really?" Dr. Eggman looked surprised.
"Yes! I can take down anyone with my forces!" Oleg's eyes were dancing now.
Dr. Eggman grinned. "Okay! We'll take my time machine!"
Oleg nodded, and the doctor led him to his machine, in which Oleg had packed an entire Soviet M.C.V. for the trip.
They entered it. "How do you know how to get back?" Oleg asked.
"Relax, I got here, didn't I?" Dr. Eggman replied, and activated the machine. As soon as he did that, the time machine disappeared.