Alex Wilder was portrayed by Rhenzy Feliz in the Hulu television series Runaways, which is connected to the Marvel Cinematic Universe.

Alex Wilder was created by author Brian K. Vaughan and artist Adrian Alphona where debuted in Runaways #1 with most of the other main characters.

[1][3] Alex then obtains the Yorkes' copy of The Abstract, a magical book that records the past, present, and future deeds of the Pride.

[5] Alex spends most of his time deciphering the Abstract, presumably plotting how he will carry out his plan to save his parents from the Dean and Hayes couples.

[9] Chase is critically injured, and decides to stay back, and gives Alex his x-ray goggles and Fistigons for the final fight.

[7] Gert wakes up, prompting her to reclaim Old Lace, who steals back Nico's Staff and destroys the Fistigons, leaving Alex with nothing.

[11] In the pages of Avengers Undercover, Alex was resurrected by Daimon Hellstrom to become Nico's teacher in battle strategy, and to help her cope with her increased dark magical powers.

In that book, Alex set up shop in Harlem, attempting to restart the Pride by using mystical software to wipe out villains' police records and even spreading a demon drug called Redemption.

[15] The Heroes for Hire didn't stand for that though, and put a stop to Wilder's schemes, exorcising his own demon, but leaving him relatively unharmed, leading to his reappearance at the Runaways hostel's doorstep with the children of Gibborim in tow.

[15][16][17] Alex Wilder has a high-level intellect, being in the gifted area in accordance with Marvel's Power Grid, and is a skilled logician and leader.

[1] It is revealed in volume one, issue seventeen, that Alex is devoted to his family above all, outing himself as the Pride's mole, a role he undertook solely to show that he is willing to go to great lengths to keep his parents safe.

[24] In volume five, issue thirteen, Alex reemerged at the Hostel and reemphasized his decision to trade all of humanity, including his friends, to make his (and Nico’s) family immortal was based out of loyalty and protection for his parents.