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LEGO Masters Jr. is a real U.S. FOX competition series that premiered on August 18, 2025. Its first season has four episodes, hosted by Kelly Osbourne. Viewers may find it through FOX, Tubi, or digital-purchase listings, but availability depends on location, account, and changing streaming rights.
Where to watch LEGO Masters Jr. online
Because streaming rights change, check the episode listing at the time you watch. The researched availability is primarily for viewers in the United States.
| Service | Access | What to know |
|---|---|---|
| FOX | Official network page | The premiere is listed on FOX, but playback may require an eligible TV-provider login or a current FOX streaming sign-up. |
| Hulu | Subscription streaming | LEGO’s official show page advertised next-day Hulu availability after the original FOX broadcasts. Confirm that the complete season remains in Hulu’s catalog before subscribing. |
| Tubi | Free with ads | JustWatch’s U.S. listing reported Tubi availability in a June 26, 2026 check. Verify the live listing, since free titles can change. |
| Amazon Video | Digital purchase | JustWatch listed Amazon Video as a purchase option. Prices and availability vary by country and account; do not assume that a regional listing reflects U.S. pricing. |
| Apple TV | Series listing | Apple TV lists the 2025 four-episode series, but a listing does not necessarily mean the episodes are included with a subscription. |
Practical tip: If a service shows the title but playback is unavailable, check individual episode listings and your U.S. location, provider login, subscription tier, or purchase region. An indexed page is not a guarantee that the license is still active.
When did LEGO Masters Jr. premiere?
The U.S. series premiered on Monday, August 18, 2025, on FOX. FOX’s advertised run lasted from August 18 through September 8, 2025, and the first season contains four episodes. It is therefore a completed short-season competition rather than an upcoming 2026 premiere.
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The premiere, “Disney Train Ride,” is listed by FOX as a 43-minute episode.
Who hosts LEGO Masters Jr.?
Kelly Osbourne hosts LEGO Masters Jr.. She is the host, not one of the judges or Brickmasters, and should not be confused with the host of the main U.S. LEGO Masters series.
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LEGO Masters Jr. cast and judges
Host
- Kelly Osbourne
Judges and Brickmasters
- Amy Corbett
- Boone Langston
Celebrity teammates
The adult celebrity partners named in FOX’s program materials are:
- Andy Richter
- Ravi Patel
- Jordin Sparks
- Alison Sweeney
- Porsha Williams
These celebrities team up with junior builders; they are not the junior contestants themselves. The available official listings do not establish a complete contestant-by-contestant roster, so names beyond the adult lineup should not be treated as verified.
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What is the show about?
LEGO Masters Jr. is a junior-focused spinoff of the U.S. LEGO Masters format. Five junior LEGO duos compete in themed building challenges, with each duo working alongside a celebrity teammate. Amy Corbett and Boone Langston evaluate the builds as the Brickmasters.
The winning team receives a $50,000 grand prize, a trophy, and the LEGO Masters Jr. title, according to FOX’s program sheet. Amazon listings describe the junior builders as ages 9–17; that age range should be treated as a platform-provided description rather than a universally verified casting rule.
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Episode guide
- “Disney Train Ride”
- “Celebrity Stunt Doubles”
- “Harry Potter”
- “Ninjago”
The episode titles are listed by Apple TV. This guide avoids revealing the winner, so it can also help viewers plan a spoiler-free watch.
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Apple TV lists the series as TV-PG and 9+. Parents should review the rating and any platform-specific advisories, especially when watching with younger children.
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- It supports the latest features: 1ms, low EMI, SBTM, 48Gbps Bandwidth, ALLM, VRR, QMS, QFT, Dynamic HDR, HDR10, CEC, HDCP 2.2 & 2.3, VESA DSC 1.2a.
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Is there a second season?
The cited official materials establish the four-episode first season but do not establish a season-two renewal. Treat any unverified announcement or listing as speculation unless FOX or LEGO publishes an official update.
For fans who want to build along
LEGO’s official page also promotes LEGO’s child-focused creative experiences, including the LEGO Play app and building sets. These are optional companion activities, not substitutes for watching the series. Product availability, pricing, and age suitability vary by market.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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