The Secret Adventures of Tom Thumb

Set in a world of dark and shadowy tenements, shining high-tech labs and septic landscapes of garbage and ruins, a tiny child is mysteriously born to a couple in the seediest part of town. Tiny Tom is snatched by sinister forces who kill his mother and force him to undergo evil experiments in a lab full of mutant creatures. He narrowly escapes into a world where he finds companionship with people his own size and starts to fight back against the "giants" alongside Jack the Giant Killer. Together, they track down Tom's father. But later, in a dark alley where drunken men congregate, Tom witnesses a violent fight in which his father is beaten to death. The two small friends find themselves alone in the hostile city. They "hi-jack" a giant and make their way to the laboratory, eventually reaching the diabolic Imp Chamber. Bent on destruction, Jack releases the Imp's raging energy, causing a chain reaction that envelopes Tom who is reborn into a world full of light and love... or is it? (official distributor synopsis)