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the main point is that there are no rogue planets the size of mars anywhere near our solar system if there were we would have seen them years ago. we could easily detect something that big way beyond the orbit of Pluto (which is much smaller than mars).
When the Shoemaker-Levy hit Jupiter nothing happened..
QuoteWhen the Shoemaker-Levy hit Jupiter nothing happened..Some of the pieces of the comet Shoemaker-Levy made a fireball the width of the Earth - I wouldn't exactly call that "nothing". http://en.wikipedia.org/wiki/Comet_Shoemaker%E2%80%93Levy_9#Impacts [nofollow]
Obviously a large body passing, say at ½ LD wouldn't necessarily stay there for long. So, we might have a global super-tide for at most one day. And, it would have far more warning than an earthquake, so ships could head out to sea, and coastal communities could evacuate