oi ummm I've been watching the shows on youtube and just wondering whats the episode be...

oi 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 you know PLEASE spare some of your time to help me?
P.P.S if you know what channel and time and if dia I can watch TMNT on TV?