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From the pictures below, can you find the cartoon character?

EDIT: Edited the 3rd picture for clarity

A small hint:

A scientist

Spinning a bit further on Udhay's answer, I will try:

Star Blazers, an ABC anime/cartoon show

First image, basically the same reasoning as Udhay:

The Accelerator, Brake and Clutch brake pedals point to ABC

Second image

The old seasons where originally released in the early 70ies, while a new remake has been made since 2012.

Third image

Literally an image of a Star Blaze.

Is the answer:(not very sure)

Professor Triffid in Buzz lightyear of star command

1

As hinted abc by other answers, buzz lightyear of Star command has been broadcast by abc

2

Old to new: the characters have taken a new look in the Toy story

3

Stars and comets: prof. Triffid is a scientist(your hint) who researches on planets. The cartoon series is about space rangers.

I thought answer is

Mickey Mouse

First image

indicates Accelerator Brake Clutch which is ABC. The Mickey Mouse program was first televised for four seasons, from 1955 to 1959, by ABC(American Broadcasting Company).

Second image

indicates Old to New which is from ABC to The New Mickey Mouse Club.
The show was revived three times after its initial 1955–1959 run on ABC, first from 1977 to 1979 for first-run syndication as The New Mickey Mouse Club, then from 1989 to 1996 as The All-New Mickey Mouse Club.

Third Image

indicates Disney–ABC Domestic Television and Mickey was voiced by his creator Walt Disney and ABC is property of Walt Disney Television.

I think the answer is:

Elroy Jetson

First image:

As stated by the other answerers, the first image stands for Accelerator Brake Clutch (ABC) which indicates that the cartoon must be broadcasted by ABC (American Broadcasting Company). The Jetsons is broadcasted by ABC.

Second image:

The Jetsons is the new counterpart to the old The Flintstones, as stated in the Wikipedia article on The Jetsons: "It was Hanna-Barbera's Space Age counterpart to The Flintstones."

Third Image:

Elroy owns a pet called Astro.