Sheldon J. Plankton, the owner of the Chum Bucket, has been a staple of SpongeBob SquarePants since the first season. His nefarious schemes are always foiled in one way or another, and his life's goal ...

SpongeBob SquarePants is leaping forward — while also looking back — to celebrate the franchise's 25th anniversary, and TVLine has an exclusive sneak peek at the show's latest journey through time.