since OOO is owned by sega it could be possible Dr. robonik/eggman could be a boss
the reason Dr. robonik/eggman came to cradle: Dr. robonik wanted to find another power source to use against sonic
enemies to expect (mostly construct)
octus (gun puppys)
Orbinaut (wisps)
newtron (construct cromalisk)
and finally Dr. robonik
5 phases
phase 1 is his regular egg pod
phase 2 is his drill car from sonic 2
phase 3 is his egg walker
phase 4 is his egg salamender
phase 5 is his nega wisp armour from sonic colours
attacks: laser (combo) (phase 1), drill (phase 2), phase 5 attacks are in this video, rapid blaster (phase 3), camofloge (phase 4)
Dr. Robotnik also gets his own boss music
I'm getting a vibe here... a vibe that's telling me to crash the Huygens into your house.