The Thundermans: Undercover

Where to Watch The Thundermans: Undercover Season 1 Episode 21 Online Free - Love Is in the Lair

The Thundermans: Undercover Season 1 Episode 21, titled "Love Is in the Lair", is ready to stream on MyFlixer. Watch the full episode in HD without signing up, and use the Season and Episode buttons beside the servers to jump anywhere in the action & adventure series.

The Thundermans: Undercover is a action & adventure, kids and sci-fi & fantasy series that first aired on January 22, 2025 on Nickelodeon. Created by Jed Spingarn, it stars Kira Kosarin, Jack Griffo, Maya Le Clark and Nathan Broxton. So far it spans 2 seasons and 39 episodes and its current status is "Returning Series". Season 1 has 26 episodes, and episode 21 originally aired on September 17, 2025 with a runtime of about 22m. The show holds a 8.4/10 rating on TMDB.

What happens in "Love Is in the Lair": Mrs. Wong visits Secret Shores, and threatens to reveal the Thundermans' superhero identities to the town. But Max and Phoebe's plan to have Dr. Colosso keep her quiet backfires in ways they could not have imagined.

Use the Season and Episode selectors next to the server buttons to move to any other episode of The Thundermans: Undercover without reloading the page. The complete Season 1 episode list is below, and viewers who follow The Thundermans: Undercover on MyFlixer also stream Teen Titans, Mighty Med and The Thundermans.

The Thundermans: Undercover Season 1 FAQ

Is The Thundermans: Undercover Season 1 Episode 21 free to watch on MyFlixer?

Yes. Every episode of The Thundermans: Undercover, including Season 1 Episode 21, streams free in HD on MyFlixer (MyFlixerz) with no registration.

How many episodes are in Season 1 of The Thundermans: Undercover?

Season 1 of The Thundermans: Undercover has 26 episodes, and all of them are listed on this page with direct watch links.

When did The Thundermans: Undercover Season 1 Episode 21 air?

Episode 21 of Season 1 ("Love Is in the Lair") first aired on September 17, 2025.

Can I watch The Thundermans: Undercover on my phone or TV?

Yes. The MyFlixer player works in any modern browser on Android, iPhone, iPad, laptops, desktops and smart TVs, with no app to install.