|First appearance||Achub Y Morfilod|
|Voiced by||Jason Hughes|
Dafydd Llewellyn is a Welsh terrorist/freedom fighter for the Free Wales Army. He seems to have some unnamed intellectual disability. He appeared in the episode "Achub Y Morfilod." He is voiced by Jason Hughes.
Dafydd is a deeply patriotic Welshman who shares his brother Lloyd's Seperatist and anti-English attitudes. Together they engage in anti-State activities like blowing up dams. Lloyd serves as the brains of the operation while Dafydd provides the brawn. The two are often on the run. On one of their missions, Dafydd is shot in the leg, so Lloyd, in desperation, contacts the CIA for aid.
An injured Dafydd is carried into the cottage Sterling Archer and Lana Kane are renting. Lloyd bandages Dafydd's leg and explains their activities to an incredulous Lana. As she storms out, Lloyd questions why she's so angry and Arhcer explains the whole farcical situation that led them here.
Things get difficult when Agent Bardsley from MI5 shows up hot on the brothers' trail. Lana, in an attempt to deceive the agent and make Archer jealous, poses as Lloyd's wife while Dafydd and Archer hide in the closet. When she passionately makes out with Lloyd, Archer becomes enraged whereas Dafydd becomes aroused. While Dafydd "[jerks] off into a hat," Archer bursts out of the closet, he and Lana blow their covers, and Lana knocks Bardsley unconscious.
While Archer and Lana argue, Lloyd secretly steals Archer's pistol and makes toast, much to Dafydd's delight. He turns the gun on the three spies intending to kill them, but Lana knocks him out. Dafydd emerges from the closet infuriated. After duking it out with Archer, the two groups part ways: Archer and Lana drive off with the kidnapped and uncouncious Agent Bardsley while Lloyd and Dafydd go on the lam to continue their resistance movement against England.
- Lana refers to Lloyd and Dafydd as "George and Lenny." This is a reference to "Of Mice and Men" as the two main characters are a small but smart man and a large but mentally slow man.