Guide

Todd is a Wraith with whom the Atlantis Expedition has made contact several times. He first appears in the third season episode "Common Ground", returning in the fourth season as a recurring character, which also formally introduces his "name" as "Todd". He is distinguished by a starburst-shaped tattoo centered around his left eye. While his real name is unknown, he was named "Todd" by Lieutenant Colonel John Sheppard after a guy he knew from college who was very pale.

Biography
Before his capture, Todd was a Wraith of some political standing; after being freed he is in loose command of about a dozen Hive Ships (out of at least 60 in the galaxy), and these had remained loyal to him during his imprisonment, implying that he used to command even more. He notes that his time spent in Commander Kolya's prison diminished his standing among the Wraith, further supporting the notion that he held a great deal of influence beforehand. He's also an adept scientist, having a significant understanding of nanite coding and Wraith technology in general.

Todd's personality is unusual for a natural pure-blooded Wraith. He is reasonable, surprisingly loyal, and to a degree quite honorable, keeping his bargains rather than manipulating them. He is far more willing to make compromises and deals with humans and acts far less arrogantly in their presence. During his imprisonment with Sheppard, he commented that it would be worth escaping just to see the stars again, implying that he has a sense of beauty and appreciation of freedom. He also seems to regard the act of feeding as more of a necessity than an act of sadistic pleasure. More recently, due to his continued presence among the Atlantis teams, he seems to have developed a grudging respect for the teams' various abilities. During Teyla's telepathic struggle with a Queen, he is seen looking on with a degree of surprised admiration. It is unknown how much of his personality is due to his long imprisonment and contact with humans. He still retains considerable standing among the Wraith, although it has significantly waned.

2006
When first introduced, "Todd" (then unnamed) first appeared as a prisoner of the Genii forces loyal to Commander Acastus Kolya. As part of their plan to get the Atlantis Expedition to turn over Ladon Radim, the current leader of the Genii, Koyla threatens to have Todd to periodically feed on, but not completely drain, Colonel John Sheppard. He was allowed to feed on Sheppard three times only for several seconds to force Elizabeth Weir to give him Ladon Radim, before they finally conspired together to escape the Genii prison; Sheppard having given Todd a new sense of hope. Working together, the two overpower Kolya's guards and escape, only to be cornered as they approach the Stargate. In order to gain the strength to fight them off, Todd almost completely drains Sheppard, leaving him barely alive but allowing Todd to easily kill the Genii soldiers approaching them. To repay Sheppard for freeing him, he drains the Genii soldiers he overpowered and uses their life-force to regenerate Sheppard which he referred to as the Gift Of Life; Doctor Rodney McKay even claims that Sheppard looks younger than he did before. Sheppard, in turn, leaves Todd on another planet to link up with his hive. Both he and Sheppard agreed to honor their deal of letting the other go with Sheppard warning Todd again that should they meet again, they would be enemies. Todd suggested that it would be good, for both their sakes, that they never meet again.

2007
Todd returns a year later to forge an alliance with Atlantis Expedition against the Asurans, with whom the Wraith were now at war with, while also informing Atlantis of the Asurans new strategy of wiping out every human in the galaxy to deprive the Wraith of a food supply. Since the efforts of the Atlantis personnel have rendered the Wraith's previous virus ineffective in shutting off the Asuran Wraith-attack command, he needs their help to adjust it, jokingly offering to to secure their truce with a handshake. He is stranded on Atlantis after the Hive Ship which brought him is destroyed by another suspicious Hive.

He remains in Atlantis custody for weeks, working with McKay on the nanite coding. He also agreed to help McKay in shutting down the nanites in Jeannie Miller's body, but only after he was allowed to feed on the man who had infected Jeannie. During this time on Atlantis, he hacked McKay's computer and took the macro for the Carter-McKay Inter Galactic Gatebridge (which was later stolen from him), allowing the Wraith to attack Midway Station and Stargate Command.

2008
Todd eventually secures his freedom when he convinces seven Wraith Hive Ships to join with Atlantis' two Daedalus-class battlecruisers and the Travelers on an assault of the Asuran homeworld. Todd uses the battle as a distraction to covertly steal several ZPMs from the Asuran homeworld the planet before it was destroyed, in order to power a massive Wraith Cloning Facility, which he wanted to use to create his own Wraith army able to wipe out his rival Wraith fractions. He is, however, betrayed and imprisoned by a rival hive, set to be fed upon by a Wraith Queen once he outlives his usefulness. Sheppard's team locates his damaged ship and frees Todd, and together they destroy the facility by ramming it with the damaged Hive-Ship. He escaped this hive ship on a dart separately from Sheppard's team.

Later, it is revealed that Todd provided information to a Wraith faction allowing them to attack the Midway station and Stargate Command, implying that he conducted espionage on the expedition during his stay in Atlantis, and that he is still alive. This is later confirmed when random outbreaks of a modified version of the Wraith-poisoning inoculation prompt Todd to arrange another collaboration in order to stop the threat to both races. When confronted with his apparent involvement in the Midway incident Todd admits to stealing information from McKay's laptop, but insists that the Wraith who planned the Midway occupation stole the information from him in turn. Given his shock over their accusation that he had something to do with this, he was likely telling the truth.

Alternate realities

 * In the alternate future, Sheppard learns of Todd's fate, when he accidentally traveled 48,000 years into the future. It is revealed that Todd died fighting alongside Ronon Dex in an attempt to destroy one of Michael's research facilities. This is ironic in a poignant point of view, as Ronon had always held a begrudging resentment towards Todd since they first met. It is possible the two may have come to terms with one another, seeing as they had a common enemy to deal with at the time.