Teenage Mutant Ninja Turtles - Season 2 Episode 4 -

After the batteries died in the alien crystal converger, Donatello, using spared circuits from the space ship, builds a tracking device to help locate the second fragment of the Eye of Zarnov. On the streets, the tracking device picks up the signal and leads the Turtles to a branch of a bank where a hold-up has just occurred.