Build-A-Bob (3826) is a SpongeBob SquarePants LEGO set that was released in 2006. It consists of a large SpongeBob figure with many interactive components. It also includes a Plankton minifigure which is different from that of the one featured in the LEGO set Heroic Heroes of The Deep (3815). The SpongeBob model looks different from the rear. It includes many features that are interactive, which ranges from his brain to his face changing its expression.
- The set is loosely based on the episode "Plankton!," Plankton's first appearance of the show.
- This is the only SpongeBob set that isn't minifigure scale.
- This is also the only SpongeBob set not to include a SpongeBob minifigure, although he is the set.
- Its name is a parody of a real life toy retailer Build-a-Bear.