An ancient pod is found deep underwater. The pod contains an Energy Being known as Ha'gel. The Taelons reveal that the Kimera, Ha'gel's people, betrayed the Taelons and are not to be trusted. However, in truth, the Kimera helped the Taelons and were themselves betrayed and driven to extinction by them. Ha'gel takes on the appearance of various humans and attempts to produce a human-Kimera hybrid but to no avail. Agent Beckett discovers the Resistance base but is then impregnated by Ha'gel in the form of Sandoval. Boone manages to convince Ha'gel that they're on the same side, but when the cops burst in and Ha'gel turns to kill them, Boone shoots the Kimera, vaporizing him, while Ha'gel's hand blasts deal serious damage to Boone. While he's in a healing tank, Boone is vaporized by Zo'or.
- The Assimilator: According to Da'an, ten million years ago, the Kimera infiltrated the Taelon race and used a genetic virus to assimilate them into the Kimera. The modern Taelons are the result. It's all a lie, though. The Taelons did indeed change, but only because they were dying and the Kimera helped them.
- Cassandra Truth: Beckett tells Sandoval that Lili is working for the Resistance. He doesn't believe her without proof.
- Character Death: Zo'or vaporizes Boone, while he's in a healing tank.
- Do You Want to Copulate?: Beckett openly talks to Sandoval about wanting to sleep with him. When he points out that, as implants, their duty is to the Taelons, she counters that duty doesn't eliminate the physical urges. He suggests that Boone may be more to her liking.
- Double Standard: Rape, Sci-Fi: Ha'gel uses his powers to seduce women and try to impregnate them. They usually end up dying in the process.
- Dropped a Bridge on Him: Zo'or vaporizes Boone, who is in a healing tank after Ha'gel's attack.
- Energy Being: Ha'gel is a Kimera, who exists as energy unless he copies a human. In fact, when he copies them, he does this down to their DNA. In distant past, the Kimera helped the dying Taelon race. The Taelons repaid them by driving the Kimera to extinction.
- Hand Blast: Ha'gel can emit deadly beams of energy from his palms.
- Healing Vat: Boone is in one after being seriously hurt by Ha'gel. Apparently, the tank has a "vaporize" feature, since that's what Zo'or does to him, seeing an opportunity to remove the nuisance.
- Kill and Replace: Sort of. Ha'gel doesn't actually kill the people he replaces. He encases them into a cocoon of sorts. When he switches appearances, the previous victim comes out of the cocoon.
- Last of His Kind: Ha'gel is the last of the Kimera. His primary goal in the episode is to reproduce.
- Mutual Kill: In a way. Boone and Ha'gel shoot one another. Ha'gel is vaporized, while Boone is seriously hurt. Boone is placed in a Healing Vat, and Zo'or takes the opportunity to get rid of him, permanently.
- Out with a Bang: Ha'gel's human female partners end up dying during his attempts to impregnate them, unable to handle the energy. Their facial expressions indicate they were enjoying the experience.
- Wham Shot: Zo'or vaporizing Boone in a healing tank.
