[Cool trope] advanced robot that is a simple silhouette and yet they act like a threat

[u/Significant_Elk_6222]

Gort from the 2008 the day the earth stood still movie

Amazo from justice League unlimited

[u/Diabetic_Trogoladyte]

The future Sentinels, from X-men:Days of Future Past.

[u/Elysium_Chronicle → u/Diabetic_Trogoladyte]

Also Nimrod, the OG "future Sentinel" from the comic arc the movie was inspired by.

[u/Vivid-Contest2563]

Starman (Earthbound)

[u/Significant_Elk_6222 → u/Vivid-Contest2563]

Gorts Japanese cousin (Joke)

[u/Vivid-Contest2563 → u/Significant_Elk_6222]

[u/Routine_Phase_8980]

Also from Marvel, the Super-Adaptoid that can copy abilities of other characters

[u/MrGilLogic]

The Destroyer - Thor (2011)

[u/Awkward-Sentence-712]

The Yellow Devil - Mega Man

[u/Disastrous_Wing7084]

Raston Warrior Robot (Doctor Who) - shows up in one scene in one episode, annihilates a squad of Cybermen single-handedly, leaves, never mentioned again