こんにちは ummm I've been watching the shows on YouTube and just wondering whats the episode be...

こんにちは ummm I've been watching the shows on YouTube and just wondering whats the episodes before the ones called Return To New York? apparently Shredder is back and kicks their shell and I want to watch it before I watch Return To New York!?
P.S. if あなた know PLEASE spare some of your time to help me?
P.P.S if あなた know what channel and time and if 日 I can watch TMNT on TV?