Murph (on right) with her cousin, Ms. Frizzle.

Katrina Eloise "Murph" Murphy is Ms. Frizzle's lovely first cousin who owns and operates a recycling plant. She teaches the class the value of recycling in the episode "Holiday Special". Just like the Friz, she has red hair. She loves recycling and hates seeing things being wasted.  In The Magic School Bus, she is voiced by Dolly Parton and in BabyFirst on the Magical School Bus, she is voiced by Zooey Deschanel. She teaches Wanda and Arnold the importance of recycling after Arnold recycles Wanda's toy soldier by accident and Wanda develops a hatred towards recycling. She reminds them that many things called "junk" can actually be recycled to make something new.

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