The first play in the trilogy, called Phineus, presumably dealt with Jason and the Argonauts' rescue of King Phineus from the torture that the monstrous harpies inflicted at the behest of Zeus. The subject of the third play, Glaucus, was either a mythical Corinthian king who was devoured by his horses because he angered the goddess Aphrodite (see Glaucus (son of Sisyphus)) or else a Boeotian farmer who ate a magical herb that transformed him into a sea deity with the gift of prophecy (see Glaucus).
In The Persians, Xerxes invites the gods' enmity for his hubristic expedition against Greece in 480/79 BCE; the focus of the drama is the defeat of Xerxes' navy at Salamis. Given Aeschylus' propensity for writing connected trilogies, the theme of divine retribution may connect the three. Aeschylus himself had fought the Persians at Marathon (490 BC). He may even have fought at Salamis, just eight years before the play was performed.
The satyr play following the trilogy was Prometheus Pyrkaeus, translated as either Prometheus the Fire-lighter or Prometheus the Fire-kindler, which comically portrayed the titan's theft of fire. Several fragments of Prometheus Pyrkaeus are extant, and according to Plutarch, one of those fragments was a statement by Prometheus warning a satyr who wanted to kiss and embrace the fire that he would "mourn for his beard" if he did. Another fragment from Prometheus Pyrkaeus was translated by Herbert Weir Smyth as "And do thou guard thee well lest a blast strike thy face; for it is sharp, and deadly-scorching its hot breaths.