The Science Fiction Growth Chart We All Should Have Had
Except mine would have been all superheroes, villains, and side kicks. The low end could have had the Atom, Scarface, Sargent Kemlo from Top Ten (without his exoskeleton), then in the middle Robin, Jenny Quantum, Rogue, and rounding out with Batman, Superman (slightly taller), and Plastic Man (stretched).
Click through for the whole grapic (including daleks, Yoda, and a hobbit) which can also be downloaded as a .pdf here, so you can print it out for your own kid, inner or otherwise.
(via Geeks Are Sexy.)