“Meltdown” is episode twelve of season three of Farscape.
Talyn, and the crew on board, cannot detect Moya, when suddenly Talyn starts acting strangely and he starts flying into the sun. The sun is apparently emitting an unusual type of radiation, which is drawing Talyn in. Disaster is averted, but Talyn is damaged.
Talyn is leaking some sort of fluid, which is affecting the crew in different ways, and Talyn, although orbiting the sun, is still feeling drawn in by the radiation pulses.
There are also two intruders aboard the ship, one of whom looks much nicer than the other. The ugly, dangerous looking one warns them that the star is a siren star that has killed 83 other leviathans. Is the nice looking intruder the one who can be trusted, or is it the other one?