After defeating the Shredder thanks to Venus, the Turtles faced a new threat.
An evil Dragon lord seeks revenge on the one who trapped him (Chung I). But it wasn't enough, now he seeks to destroy the turtles as well as Venus.
In future episodes, there are other crazy characters seeking out to get the turtles.
Dr Cornelius Quease was a renowned scientist and an expert on mutation.
Silver was the last yeti on earth and besides living on the mountains, he too lives in New York who owns his own crime business and wants nothing but money.
Simon Bonesteel was a crazed poacher who sooned discovered the turtles and would stop at nothing to poach them, every time he got his butt kicked, it just made him angrier and the turtles called him 'Bonehead'.
Vam-Mi was an evil female vampire who was defeated by Chung I when he tore out her heart until she was freed by her henchmans Chi Chu and Bing who told her that Venus had her heart, so they headed to New York to defeat the turtles and retrieve Vam Mi's heart.