In the Pilot episode, when Jerry came across Rick and Morty, returning from their adventure, when Morty should have been at school, Jerry yelled at Rick in anger and addressing him as "Albert Ein-douche." This was a pun on Albert Einstein's name.
Albert Einstein would not make his first physical appearance until the episode A Rickle in Time, in the post-credits epilogue. Here, the Fourth Dimensional Being, after previously being beaten unconscious by Rick, causing him to lose him and fail to arrest him for his crimes against space time, went through time with his partner, looking for him. They eventually came across Albert Einstein in his lab and proceeded to beat him senseless, telling him not to mess with time. They most likely did this in belief that it was Rick. After they left, Albert quickly got back up and angrily said to himself that from that point on, he will mess with time.
Albert Einstein is a short scientist with white, spiky hair and a uni-brow and a mustache and glasses. He wears a lab coat and a yellow shirt and green pants and black shoes.
- His hair is the exact same hairstyle as that of Rick's. This is most likely done intentionally as his hairstyle is also depicted and animated the exact same way.