Muscle Bean is the twenty-seventh episode of season 4 in the animated series.
Mr. Bean needs to impress Irma, who is infatuated with the hunky deliveryman. Bean tries to improve his physique at the gym, but has little success. Instead he opts for an inflatable rubber muscle suit. At the library, Bean impressed Irma with his muscular body but she did not know that there was a muscle suit within him. They went to the park and Bean gave Irma a rose. However, Bean sat on the rose and it went through the rubber muscle suit, causing it to deflate. Bean went to the toilet to inflate it but it failed. He climbed out and went to a nearby shop selling balloons and asked for some helium gas and a sticker to patch the deflated spot. This time, Bean inflated into a bigger size but flies into the air where he gets stuck onto a tree. The deliveryman tries to save him but is afraid of heights. Irma climbed the tree but accidentally used a twig and deflated the rubber suit again, causing Bean to fly into the sky and fall down. Bean then ties the suit and gives it as a present to Irma.