Characters in the old toon that re-appeared for a sequel ep
 

Aside from the recurring villains who got 4 or more episodes, some previous one-shot characters returned for a second episode. I can think of:

- Lotus Blossom got 2 episodes
- Bugman returned for a second episode in Season 5
- Rex 1 returned for a second episode in Season 5
- The Polarasoids returned in Season 5 (notice a pattern?)
- Prof. Sopho returned in Season 6
- April's Aunt Agatha returned in Season 6

I always felt Mona Lisa and Shreeka should have returned for a second ep but never did.

Pretty sure Agatha Marbles had more than four appearances.

LESS THAN 5 APPEARANCES, ONLY 1 SEASON
Roadkill Rodneys
Don Turtelli
Usagi Yojimbo
Donald J. Lofty
Howie Hardy
Hokum Hare
Titanus

LESS THAN 5 APPEARANCES, MULTIPLE SEASONS
Human Hamato Yoshi
Rex-1
Lotus Blossom
Human Bebop & Rocksteady
Bebop & Rocksteady's old gang
Agatha Marbles
Frip The Polarasoid
Metalhead
Baxter The Fly's computer friend
Professor Sopho
Pinkie McFingers
"Mad Dog" McMutt
Slash The Evil Turtle From Dimension X
Big Louie
Bugman
Tempestra
Mondo Gecko
Kerma
Chrome Dome

LESS THAN 10 APPEARANCES, MULTIPLE SEASONS
Neutrinos
Human Baxter Stockman
Baxter The Fly
Punk Frogs
Zach, The Fifth Turtle
The Rat King
Leatherhead
Casey Jones

NO MORE THAN 16 EPS, MULTIPLE SEASONS
General Traag
Carter
Dregg
Hi-Tek
Mung
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Sheekra was in 3 episodes that I can think of.

Mung was only in one season: Season 10.

Pretty sure you're confusing Shreeka (voiced by Eartha Kitt) who only had one ep and Tempestra (Leo's videogame-based rival) who appeared a 2nd time in "Night Of The Rogues".
Nit-picker! :tgrumble:

Aah your right sorry about that.

As an adult, I consider Lotus to be quite possibly the most interesting character featured in the original TMNT cartoon. I would've liked to have seen more of her. However, in her second episode the creators kinda gave her a happy ending, and thus closing her story.

Its a shame some characters like Merdude and Rahzar/Tokka were introduced so late in the series, in Season 7. They probably would have returned for a second episode had either Season 8 gone on for longer or they hadn't phased out all old characters by Seasons 9-10.

From Red Sky, we can add H.A.V.O.C. (3 episodes), Dregg's Techno Gang (at least 3 episodes), Mung's Bat-Men in Season 10, as well as Landor & Merrick (3 episodes).

Its a shame these characters were one-shots:

- Mona Lisa
- Shreeka
- Rahzar/Tokka
- Merdude
- Ray
- Mutagen Man
- Muckman/Joe eyeball

All should have gotten at least a second episode.

I'm eternally grateful we never saw Ray a second time. To a far lesser extent, the same goes for Mutagenman and Muckman. The fact that Tokka & Rahzar were shoehorned into that one ep would have seemed a lot less pathetic if they were given a second appearance tho. Merdude & Mona Lisa not getting second eps tho: absolute tragedy... :ohwell:

Yeah,very criminal.

What episode besides Enter the Shredder did the Roadkill Rodneys appear in? And you forgot Groundchuck and Dirtbag.