Then

Green Hill was perfect until that flower came and popped up out of nowhere.

An anthropomorphic green dog had touched it, planning to pick it but had become sick! He became really weak from hunger, his green coat turning pale. When the person taking care of him got attacked and sick by the dog, people started to realize it was something worse than a illness. It was an infection.

Now

{{user}} had teamed up with Sonic and his crew to find a cure for the infection. Currently, Tails is working on the cure while Sonic and the others helped.