The alternate voices in the old toon for the main cast
 

What is your opinion on them?

Shredder's alternate was decent and probably the better of the bunch, although James Avery was far superior

Krang's alternate in Season 3 was a bit too squeaky. Sometimes it sounded similar to the original but others too high and "bubbly."

Don's alternate was alright, he was in quite a few eps too. I guess I just got used to it after hearing it so much.

Raph's alternate in the early seasons absolutely sucked. In "The Ninja Sword of No-where" I cringed everytime Raph spoke. Also in that other ep where Irma is a robot.

I haven't watched Season 10 in awhile so I don't have an opinion on that Raph voice yet.

I hate to say this about Townsend... but I HATE HATE HATE HATED his Krang... it sounds like a parody of himself. Just watch Cowabunga Shredhead... I hate how he goes "Blehwuhwuhblehbloo Shredder....." trying to emulate what Pat did. It just didn't work.

That said, I actually kinda like Don and Bebop's alternate. Partially because he was Baby Fozzie...

Is Don's alternate in all the European vacation eps? I remember someone saying that.

I'm eager to see once Season 7 comes out.

Barry Gordon voiced Don in all European vacation episodes except for Ring of Fire in which Greg Berg voiced him.

What about Raph? Is he the same in European Vacation or an alternate?

Hal Rayle voices Raph in all the European episodes.

The alternate voices were all very different from their originals but I liked them. Not more than the main cast but I was glad that they seemed almost a new take instead of just trying to imitate too much. So yeah I like them

Did he do a good imitation of Rob Paulsen? I haven't seen these episodes in YEARS so I don't know what to expect.

Hal Rayle is the same Raph alternate from season 3. I didn't like his Raph that much.

In fact, the only turtle who never had an alternate was Mikey.

For Channel 6 People, April & Irma, and bad guys, Rocksteady.

Leo never had an alternate voice either.
Rocksteady never did either because Cam Clark voiced both Leo and Rocksteady.

Really? I thought there was a leo alternate in one or two eps. Huh.

Yeah, Cam was Leo's voice actor for every episode.

turkishproverb, there was one rare episode where Leo had an alternate voice actor. I say this because when I heard him speak you could tell the difference. I'll be damned if I remember the name of the episode though, and no it's not 'Shredder's In Love'. :|

Raph and Splinter's alternative voices sucked, im afraid to say i can't recall how krang's sounded.

Splinter's alternate was Townsend....you can tell because it sounds like Rat King.