"Cold Feet" is the twelfth episode of season two and the twenty-fifth episode overall of the animated children's series The Magic School Bus. It originally aired on November 25th, 1995.
Liz has disappeared and the trail leads to Herp Haven, which is some kind of spa for reptiles. There, they see a woman named Mrs. Westlake ask for her turtle to be "toasted and stuffed, just like the last one." They decide to lead a rescue mission to find Liz, on which they learn about reptiles and how they need to move from place to place to get comfortable because they are cold blooded, which comes in handy, as Ms. Frizzle turns them into some!