| Desktop-Only Content: This information (or parts of it) applies only to the desktop version of Terraria.
The Martian Officer is a Hardmode, post-Golem enemy that spawns during the Martian Madness event. Martian Officers will always initially spawn with a protective Bubble Shield, which provides the Officer significant added defense and hit points, as well as immunity to lava and knockback, until it is depleted. After the Bubble Shield is destroyed, the Officer can now actually be harmed. If the Martian Officer isn't killed quickly after the Bubble Shield is depleted, the Bubble Shield will re-activate with full strength, after approximately 3 seconds.