The Penguin Always Rings Twice - Someone keeps stealing the zoo's peanut supply. All clues point to Jeffy the elephant, but Martha and Skits are determined to prove his innocence. Can their crack crime-fighting team - a lemur, a bat, a penguin, a baby tiger, and Jeffy - help them outwit the thieves? Vocabulary: (E) mystery, clue, culprit, hunch, motive (I) first, second, next, last, after. The Martha Code - After Martha accidentally eats a secret code, it's really, really hard to understand what she's saying. Now Martha's lost and she's leaving Helen coded phone messages. Can Helen break the code and find out where she is? Vocabulary: (E) code, decipher, message, gibberish, arbitrary (I) (un) break(able), crack, secret(s), key, figure out.