Finish Sonic Underground and Bring Back Old Characters!

Old characters we love seem to have disappeared! Also, there isn’t a very clear backstory to Sonic, and Sonic Underground was giving us that until it was shut down! I want SEGA to bring them back! Who knew that Sonic had siblings? I didn’t until I watched Sonic Underground, and I loved it! SEGA, bring back old Sonic characters and shows, with an actual finish!