This episode slightly disturbed me when I first saw it. After finding an abandoned "hospital planet" with the technology to revive Ulysses' companions, he investigates.
What he doesn't know is that the Gods have place a curse on it, in the form of deadly seeds that sense lifeforces. Once sensed, they grow very quickly and kill.
These giant flowers are quite creepy when they get fully grown, after Yumi takes her brother to revive him.
It's a fantastic episode, if slightly spooky, with brilliant chase scenes when Ulysees is running through the corridors followed by these weird metal flowers that have lasers. Check it out ASAP!