Fillmore!

Field Trip of the Just (2x13)

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Guildenstern, the Science Department's tarantula mascot, has been poisoned, and the prime suspect, Eric Orben, has escaped into the city. Fillmore is given a license to go out and track him down, but he has to contend with an relentless opponent from his bad-boy past and a case that isn't as obvious as it seems...