In the 1970s, Underdog came out with quite few banks for the kids in all shapes and sizes. I will try to display them all here with descriptions if possible.

This is a 7.5" tall hard vinyl bank of Underdog, originally manufactured by Play Pal Plastics during the early 1970s. The bank's coin slot is located on the back of Underdog's head and the original clear-plastic stopper is present on the underside of the bank. Underdog wears a long flowing blue cape, a red shirt with a white "U" on it, and black superhero boots.

This is an 11" vinyl bank showing Underdog standing with both arms bent akimbo, hands resting by his sides.  He wears a long blue flowing cape, black shoes, and a red shirt with a white U on front.  The bank's coin slot is located on the back of Underdog's neck, and the original stopper is present underneath his feet.  This item was manufactured in 1973 by Play Pal Plastics.

IMCO Leonardo-TTV 1977, 10" tall plastic bank