Plot summary
A "secret admirer" starts sending Lois booby trapped gifts, with increasingly disruptive and violent results. After some investigation, Lois and Clark discover that her "admirer" is an ex-con, Kyle Griffin ( Bronson Pinchot ), who Lois helped send to prison five years earlier. Griffin, who is also known as the Prankster, is now out of jail and is seeking revenge. Using those pranks, he can get revenge on Lois while simultaneously he using the distraction provided by the pranks to commit robberies. Lois and Clark manage to finally spot him and with the help of Superman, they have him arrested.
Credits
Adapted from Wikipedia contributors, Lois & Clark: The New Adventures of Superman season 2. HTML formatting and reference markers removed.