Mr. & Mrs. Simon are conjoined twin or bicephalous horned lizards in Harvey Beaks.
Mr. & Mrs. Simon are a two-headed horned lizard. Mr. Simon's head is on the left while Mrs. Simon's is on the right. Mr. Simon's eyeglasses are square whereas Mrs. Simon's are fancy-shaped. They both wear a beige shirt and blue pants.
- 201. "Mr. & Mrs. Borks" (cameo)
- Mr. & Mrs. Simon are the first and only actual characters that are conjoined and/or bicephalous.