Star Trek Online's Defiant and Bird-of-Prey bridges are currently available for free as part of day two of the game's pre-anniversary celebration. This the game's fourth anniversary since it launched in 2010.

The Defiant bridge became popular on the Star Trek: The Next Generation spin-off, Star Trek: Deep Space Nine's ship of the same name. The Klingon Bird-of-Prey bridge has seen numerous incarnations ever since the vessel's first appearance in Star Trek III: The Search for Spock.

Both items are available for free until tomorrow, 9am EST.