You go into the Millenium Falcon to the Death Star and Death Egg, and go into the Death Star, while Luke goes into the the Death Egg in an X-wing, you encounter the Death Egg Robot piloted by Robotnik, and the Palpaterminator, piloted by Palpatine

Robotnik: Looking for something, Soni-- Wait! YOU ARE NOT SONIC! No matter, Me and Sidious will CRUSH YOU ALL THE SAME!!! maniacal laughter as he puts a chaos emerald in his Death Egg Robot

Palpatine: Let's get this blockhead.