Mae Sali Mali mewn penbleth wrth weld olion traed dieithr ar garreg y drws ac mae'n canfod mai rhai broga ydyn nhw. Sali Mali is puzzled by mysterious footprints on her door step.

Mae pethau'n mynd o'i le i Bili Broga ar ôl iddo godi'r tŷ perffaith iddo'i hun ar lan y môr. Things go awry for Bili Frog after he builds the perfect beach house for himself.