Sonic Frontiers (Crossover DLC)

the sonic frontiers crossover dlc is a dlc pack added into the sonic frontiers game

each console version has it's own characters who make a guest appearance as Sonic gets teleported to the universe of that franchise and must team up with the heroes of that series to take down Dr. Eggman and the villain of that series as well whom Eggman teams up and must find a way back to his universe

Story Mode
Sonic along with Eggman both get teleported to another universe where they each team up with characters from that universe Sonic teams up with the heroes while Eggman teams up with the villains

PlayStation
in the PlayStation version the crossover is with Ratchet and Clank

Dr. Eggman teams up with Doctor Nefarious the emey of Ratchet and Clank

Xbox
Xbox version the crossover is with Battletoads

Dr. Eggman teams up Dark Queen who is the main emeny of the Battletoads

Nintendo Switch
Nintendo Switch version the crossover is with Starfox. Sonic is teleported to the lylat system where he later meets the starfox gang

Dr. Eggman teams up with Starwolf the long time rivals of Starfox