Mars plus Soupy plus Al equals Duck-Billed Platypus…

… because it is a Mars/Soupy/Al (Marsupial).

In a lifetime of concocting horrible puns, this is one of the worst. As far as I know, the planet Mars and Soupy Sales and Al Pacino have never before been linked to such nefarious purpose.

The text of this triple acrostic is nigh-impossible to read, doing as it does Loop-the-Loops with internally-repeating text strings, so here is a plain-text transcription:

My Mephistopheles has an Agenda
Mmmost unmysterious–yet an enigma
My bane is mucilaginous pudenda
My oddities extend to the 6th sigma

And if by chance I riff a lot, my VISA
Augmented by demented tours of ASIA
And psychical applause from Mona Lisa
Agrees then to succumb to Euthanasia

Responding to despondent plaintive plea
Retributive spare parties hunt the Fauna
Responsible for plaguing Earth and Sea
Repeatedly whipped-creamedly with Sauna

Spawn-taneously we may Breed until
Symp symphony then contraceives our Will

Fans of the Sonnet will note that this is one such: fourteen lines of iambic pentameter, Shakespearean rhyme scheme, concluding final couplet. In my immodest and self-aggrandizing opinion, no one else on Earth could have written a triple acrostic, the letter lengths of which are three/five/two, with a metaphor of such stick-together oddness summed up by the punned acrostic, cleaving to sonnet parameters, with a Zero Population Growth message embedded. Plus it has Loop-the-Loop calligraphy and loopy illustrations. Hope you like it!