Where can I watch “Lab Rats” Season 4 Episode 4 online?

This page provides episode info and a legal-only guide. It does not host streams or downloads. Check official platforms and licensed services for availability in your region (US first).

Do I need to watch earlier episodes before “Under Siege”?

Watching earlier episodes in season 4 helps you follow the plot and character arcs leading into this episode.

Watch Lab Rats Season 4 Episode 4 Online

“Under Siege” — Watch "Lab Rats" Season 4 Episode 4 online in HD for free. Check streaming providers, cast, and episode details.

Apr 1, 2015 Season 4 Episode 4 22 min TV-Y7

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Lab Rats Season 4

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Season 4 Episode 4 — Aired on Apr 1, 2015 • runs about 22 minutes.

Notable cast/guest names in this episode include William Brent, Spencer Boldman, Kelli Berglund, Tyrel Jackson Williams.

This page includes 1 official still(s) (when available) plus legal availability links.

Looking for “watch Lab Rats Season 4 Episode 4 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

When suspicious events happen overnight on the bionic island, everyone is convinced a new threat has emerged. However, this threat is revealed to be Leo, when his bionics glitch because Douglas never gave Leo a capsule.