|First appearance||"Hopelessly Demoted" (1.01)|
|Guest appearances||Maris: 4.11, 4.12, 4.14, 4.16, 4.18, 4.20, 4.22|
Isaac Bradley is a main character in the Frasier-based fan fiction spin-off MCTV.
Prior to the start of MCTV, Isaac's relationship with Diana comes to an end and he is quick to move onto meeting other women. Later however, Isaac and Diana come to realise that their on-screen chemistry has lessened ever since their breakup, so they make a pact to become sex buddies in order to better their performances. At the end of Season 1, Isaac realises his feelings for Diana extend beyond physical attraction and asks her to marry him. Around the same time, Isaac discovers that he has an illegitimate daughter named Kari, the result of an affair he had with an extra on Stick Figures. Determined not to ruin things with Diana, Isaac keeps his daughter secret from her, and resigns from MCTV after being blackmailed by Olivia Gardener's father into working for another TV station. Hiding Kari from Diana soon proves to be a struggle for Isaac and he ultimately decides to come clean with her. Diana is understanding but calls off the engagement because she feels there isn't enough trust in their relationship for it to work. Single once again, Isaac begins work on a new show, Lawson's Crack, and starts getting to know his daughter. Mid-way through Season 2, Isaac is able to return to MCTV with Diana's help and they reconcile their friendship. Halfway through Season 3, Isaac finds himself out of a job along with Diana when their characters are axed from Stick Figures. After several unsuccessful attempts at finding work, Isaac is close to throwing in the towel when he is unexpectedly offered a role in a new sci-fi blockbuster, Alien Bloodbath. Isaac is devastated when the film is poorly received, and ends up sleeping with Diana. In Season 4, it is revealed that the movie flopped financially, so Isaac takes leave from MCTV on the film studio's request to promote it further across the United States. This puts additional strain on his reconciliation with Diana and they separate once again upon his return. During Season 5, Isaac works with Diana on a new drama, Love Medicine, but the show is cancelled when Maris sells MCTV to an overseas company. At the end of the season, Isaac proposes to Diana, but their engagement falls through prior to the start of Season 6. Isaac joins MCTV once again when it relaunches as a web TV service.