Disaac

“***Isaac:** "How do you not feel this?"
**Derek:** "I feel every second of it."
**Isaac:** "Then how do you control it?"
**Derek:** "Find an anchor, something meaningful to you. Bind yourself to it. Keep the human side in control."
**Isaac:** "What is it for you?"
**Derek:** "...Anger. But it doesn't have to be that for everybody."*”
―Derek helping Isaac through his second Full Moon as a Werewolf in Party Guessed

**Disaac** is the friendship between Derek Hale and Isaac Lahey from the Teen Wolf fandom.

## Canon

Isaac was the second Beta Werewolf created by Derek Hale and the first to join his pack after he was rejected by both his first Beta, Jackson Whittemore, and his protege Scott McCall. While Derek was desperate to build his pack, Derek, in a way, took pity on Isaac, especially because he was constantly abused by his father at home. Derek (who, unbeknownst to anyone, was in a hurry to build a pack to gain power and defend himself against the Alpha Pack, who were about to head to Beacon Hills) was forced to team up with fellow Werewolf Scott McCall and his human best friend Stiles Stilinski to break Isaac out of jail during his first Full Moon as a Werewolf when he was accused of killing Mr. Lahey.

Since Isaac's personality often reflected the Alpha, he was with, Isaac became just as ruthless as Derek, intimidating both Scott and Stiles. Isaac initially followed Derek"'s every word and showed a willingness to kill Lydia if necessary if she turned out to be the Kanima. However, Isaac struggled to keep up with Derek and began questioning his training methods. As time went on, Isaac started directing his attention to Scott while remaining at Derek's side. Isaac was also the only one of Derek's Betas who gained control of his inner wolf during the full moon. After the Kanima's defeat, Isaac went to live with Derek in his loft and helped him find the missing Boyd and Erica.

In "Tattoo", Derek saves Isaac and Scott from Ennis and takes them to his abandoned house, which contains the things needed to heal Isaac.

In "Chaos Rising," Isaac meets up with Derek in the loft to recover the memories the Alpha Pack had stolen from him during his brief capture. However, they needed Peter's help to perform the memory ritual that Derek had no knowledge of. Derek says he can't do it because it could be dangerous if he attempts the ritual on Isaac. During their conversation, Isaac points out that he doesn't trust Peter because Scott doesn't either. To expand on this, he wanted to believe in Scott as well. Derek tells Isaac to trust him at the least, which he reluctantly does. Derek, Isaac, Scott, and Stiles did not trust Peter's assessment of the memories he viewed from Isaac finding Boyd and Erica. When he performs the ritual on Isaac, Peter only catches a glimpse of Deucalion and how he mentions that Boyd, Erica, and an Unnamed female werewolf will be dead before the next full moon, which is tomorrow night. Before they staged a rescue,  they went to the animal clinic to see if Dr. Deaton had any ideas. They must submerge Isaac into a tub filled with ice water so he'll slow his heart rate, be half-transformed, and transform himself into a trance state they will be able to recover his stolen memories. However, Stiles scared an already nervous Isaac by putting a rapper glove on his hand and letting it snap against his wrist, causing Derek to glare at Stiles for not taking this that seriously and making Isaac more nervous. During the procedure, Scott and Derek hold Isaac down before they can submerge him into the ice water. Unlike Scott, Derek grows frustrated when Isaac doesn't tell them where Boyd and Erica are. However, Derek's shouting method worked and Isaac was able to tell his friends that he remembered where the Alpha's were hiding Boyd and Cora. However, Isaac mentioned seeing Erica's body, much to his horror.

In “Fireflies,”  Derek, Scott and Isaac went after Boyd and Cora. The three boys were on their own at first but reluctantly went to Chris Argent for help.

In "Unleashed," the Alphas started targeting Derek's Betas. Worried that Isaac living with him made him an easier target for the alphas,  the older Werewolf kicked Isaac out of his loft by exhibiting the same abusive behavior as Isaac's father Mr. Lahey by throwing a glass at the younger Werewolf's head.

Even though Isaac was fostered by Melissa and Scott, the tension between Isaac and Derek continued because this fight continued to linger for some time. Despite their strained relationship at the time, Isaac was devastated by Derek's supposed death when he fell two stories during the Battle of the Abandoned McCall. Believing his Alpha to be dead, increased Isaac and Boyd's hatred towards the pack for taking not only Cora but apparently Derek as well. However, in "Motel California," Derek is revealed to be alive and was healed by Jennifer Blake with her mystical healing powers. Despite the tendon between the two, Isaac and Boyd worked together to protect Derek from the Alpha Pack, but to no avail as it resulted in Boyd's death. However, Isaac had enough of Derek constantly putting himself before everyone and not doing anything to help him and the Pack, other than sit there and watch Cora die. As a result, Isaac joined the McCall Pack instead. However, after Derek sacrificed his Alpha Spark to cure Cora, Isaac and Derek repaired their broken friendship until Allison's second death